| Title: | Simulation of Matrix Population Models with Defined Life History Characteristics |
|---|---|
| Description: | Allows users to simulate matrix population models with particular characteristics based on aspects of life history such as mortality trajectories and fertility trajectories. Also allows the exploration of sampling error due to small sample size. |
| Authors: | Owen Jones [aut, cre] |
| Maintainer: | Owen Jones <[email protected]> |
| License: | CC BY-SA 4.0 |
| Version: | 3.0.0 |
| Built: | 2024-09-30 06:26:52 UTC |
| Source: | CRAN |
Produces a list of matrix population models based on expected values in the
transition matrix and sample size. The expected values are provided in lists
of two submatrices: mat_U for the growth/development and survival
transitions and mat_F for the fecundity transitions. The output mat_U
values are simulated based on expected probabilities, assuming a binomial
process with a sample size defined by sample_size. The output mat_F
values are simulated using a Poisson process with a sample size defined by
sample_size.Thus users can expect that large sample sizes will result in
simulated matrices that match closely with the expectations, while simulated
matrices with small sample sizes will be more variable.
add_mpm_error(mat_U, mat_F, sample_size, split = TRUE, by_type = TRUE)add_mpm_error(mat_U, mat_F, sample_size, split = TRUE, by_type = TRUE)
mat_U |
A list of U submatrices, or a single U submatrix. |
mat_F |
A list of F submatrices, or a single F submatrix. |
sample_size |
either (1) a single matrix of sample sizes for each
element of every MPM, (2) a list of two named matrices (" |
split |
logical, whether to split the output into survival and fecundity
matrices or not. Defaults to |
by_type |
A logical indicating whether the matrices should be returned
in a list by type (A, U, F, C). If split is |
if any sample_size input is 0, it is assumed that the estimate for
the element(s) concerned is known without error.
list of matrices of survival and fecundity if split = TRUE,
otherwise a single matrix of the sum of survival and fecundity.
Owen Jones [email protected]
Other errors:
calculate_errors(),
compute_ci(),
compute_ci_U()
Other errors:
calculate_errors(),
compute_ci(),
compute_ci_U()
set.seed(42) # set seed for repeatability # First generate a set of MPMs mpm_set <- rand_lefko_set(n = 5, n_stages = 5, fecundity = c( 0, 0, 4, 8, 10 ), archetype = 4, output = "Type4") # Now apply sampling error to this set add_mpm_error( mat_U = mpm_set$U_list, mat_F = mpm_set$F_list, sample_size = 50 ) # Also works with a single matrix. mats <- make_leslie_mpm( survival = c(0.1, 0.2, 0.5), fertility = c(0, 1.2, 2.4), n_stages = 3, split = TRUE ) # Sample size is a single value add_mpm_error(mat_U = mats$mat_U, mat_F = mats$mat_F, sample_size = 20) # Sample size is a list of two matrices # here with a sample size of 20 for reproduction and 10 for growth/survival. mpm_set <- rand_lefko_set( n = 5, n_stages = 3, fecundity = c(0, 2, 4), archetype = 4, output = "Type4" ) ssMats <- list( "mat_F_ss" = matrix(20, nrow = 3, ncol = 3), "mat_U_ss" = matrix(10, nrow = 3, ncol = 3) ) # Add sampling error to the matrix models output <- add_mpm_error( mat_U = mpm_set$U_list, mat_F = mpm_set$F_list, sample_size = ssMats ) # Examine the outputs names(output) outputset.seed(42) # set seed for repeatability # First generate a set of MPMs mpm_set <- rand_lefko_set(n = 5, n_stages = 5, fecundity = c( 0, 0, 4, 8, 10 ), archetype = 4, output = "Type4") # Now apply sampling error to this set add_mpm_error( mat_U = mpm_set$U_list, mat_F = mpm_set$F_list, sample_size = 50 ) # Also works with a single matrix. mats <- make_leslie_mpm( survival = c(0.1, 0.2, 0.5), fertility = c(0, 1.2, 2.4), n_stages = 3, split = TRUE ) # Sample size is a single value add_mpm_error(mat_U = mats$mat_U, mat_F = mats$mat_F, sample_size = 20) # Sample size is a list of two matrices # here with a sample size of 20 for reproduction and 10 for growth/survival. mpm_set <- rand_lefko_set( n = 5, n_stages = 3, fecundity = c(0, 2, 4), archetype = 4, output = "Type4" ) ssMats <- list( "mat_F_ss" = matrix(20, nrow = 3, ncol = 3), "mat_U_ss" = matrix(10, nrow = 3, ncol = 3) ) # Add sampling error to the matrix models output <- add_mpm_error( mat_U = mpm_set$U_list, mat_F = mpm_set$F_list, sample_size = ssMats ) # Examine the outputs names(output) output
Given two submatrices of a matrix population model (mat_U and mat_F, the
growth/survival matrix and the reproduction matrix respectively) and a sample
size, or matrix/matrices of sample sizes, this function calculates the
standard error or 95% confidence interval (95%CI) for each element of the
matrix. These calculations assume that mat_U is the result of binomial
processes (i.e., the survival (0/1) of a sample of n individuals), while
mat_F is the result of Poisson processes (i.e., counts of offspring from n
individuals), where n is the sample size.
calculate_errors(mat_U, mat_F, sample_size, type = "sem", calculate_A = TRUE)calculate_errors(mat_U, mat_F, sample_size, type = "sem", calculate_A = TRUE)
mat_U |
matrix of mean survival probabilities |
mat_F |
matrix of mean fecundity values |
sample_size |
either (1) a single matrix of sample sizes for each
element of the MPM, (2) a list of two named matrices (" |
type |
A character string indicating the type of error to calculate.
Must be one of " |
calculate_A |
A logical argument indicating whether the returned error
information should include the A matrix and its error. Defaults to |
The output is a list containing the original matrices and matrices showing error estimates or confidence intervals.
A list containing the original matrices and the error estimates (or upper and lower confidence intervals) for the U, F and (optionally) A matrices.
Owen Jones [email protected]
add_mpm_error() which simulates matrices with known values and
sample sizes.
Other errors:
add_mpm_error(),
compute_ci(),
compute_ci_U()
# Set up two submatrices matU <- matrix(c( 0.1, 0, 0.2, 0.4 ), byrow = TRUE, nrow = 2) matF <- matrix(c( 0, 4, 0., 0. ), byrow = TRUE, nrow = 2) # errors as 95% CI, with a sample size of 20 for all elements calculate_errors(mat_U = matU, mat_F = matF, sample_size = 20, type = "CI95") # errors as sem, with a sample size of 20 for all elements calculate_errors(mat_U = matU, mat_F = matF, sample_size = 20, type = "sem") # Sample size is a single matrix applied to both F and U matrices ssMat <- matrix(10, nrow = 2, ncol = 2) calculate_errors( mat_U = matU, mat_F = matF, sample_size = ssMat, type = "sem" ) # Sample size is a list of two matrices, one for F and one for U. ssMats <- list( "mat_F_ss" = matrix(10, nrow = 2, ncol = 2), "mat_U_ss" = matrix(10, nrow = 2, ncol = 2) ) calculate_errors( mat_U = matU, mat_F = matF, sample_size = ssMats, type = "sem" )# Set up two submatrices matU <- matrix(c( 0.1, 0, 0.2, 0.4 ), byrow = TRUE, nrow = 2) matF <- matrix(c( 0, 4, 0., 0. ), byrow = TRUE, nrow = 2) # errors as 95% CI, with a sample size of 20 for all elements calculate_errors(mat_U = matU, mat_F = matF, sample_size = 20, type = "CI95") # errors as sem, with a sample size of 20 for all elements calculate_errors(mat_U = matU, mat_F = matF, sample_size = 20, type = "sem") # Sample size is a single matrix applied to both F and U matrices ssMat <- matrix(10, nrow = 2, ncol = 2) calculate_errors( mat_U = matU, mat_F = matF, sample_size = ssMat, type = "sem" ) # Sample size is a list of two matrices, one for F and one for U. ssMats <- list( "mat_F_ss" = matrix(10, nrow = 2, ncol = 2), "mat_U_ss" = matrix(10, nrow = 2, ncol = 2) ) calculate_errors( mat_U = matU, mat_F = matF, sample_size = ssMats, type = "sem" )
This function computes the 95% confidence interval for measures derived from
a matrix population model using parametric bootstrapping. In this approach a
sampling distribution of the matrix population model (MPM) is generated by
taking a large number of random independent draws using the sampling
distribution of each underlying transition rate. The approach rests on our
assumption that survival-related processes are binomial, while reproduction
is a Poisson process (see the function add_mpm_error() for details).
compute_ci(mat_U, mat_F, sample_size, FUN, ..., n_sim = 1000, dist.out = FALSE)compute_ci(mat_U, mat_F, sample_size, FUN, ..., n_sim = 1000, dist.out = FALSE)
mat_U |
A matrix that describes the growth and survival process. |
mat_F |
A matrix that describes reproduction. |
sample_size |
either (1) a single matrix of sample sizes for each
element of the MPM, (2) a list of two named matrices (" |
FUN |
A function to apply to each simulated matrix population model.
This function must take, as input, a single matrix population model (i.e.,
the A matrix). For functions that require only the U matrix, use
|
... |
Additional arguments to be passed to |
n_sim |
An integer indicating the number of simulations to run. Default is 1000. |
dist.out |
Logical. If TRUE, returns a list with both the quantiles and the simulated estimates. Default is FALSE. |
The inputs are the U matrix, which describes the survival-related processes, and the F matrix which describes reproduction. The underlying assumption is that the U matrix is the average of a binomial process while the F matrix is the average of a Poisson process . The confidence interval will depend largely on the sample size used.
If dist.out is FALSE, a numeric vector of the 2.5th and 97.5th
quantiles of the estimated measures. If dist.out = TRUE, a list with two
elements: quantiles and estimates. quantiles is a numeric vector of
the 2.5th and 97.5th quantiles of the estimated measures, and estimates
is a numeric vector of the estimated measures.
Owen Jones [email protected]
Chapter 12 in Caswell, H. (2001). Matrix Population Models. Sinauer Associates Incorporated.
Other errors:
add_mpm_error(),
calculate_errors(),
compute_ci_U()
set.seed(42) # set seed for repeatability # Data for use in example matU <- matrix(c( 0.1, 0.0, 0.2, 0.4 ), byrow = TRUE, nrow = 2) matF <- matrix(c( 0.0, 5.0, 0.0, 0.0 ), byrow = TRUE, nrow = 2) set.seed(42) # Example of use to calculate 95% CI of lambda compute_ci( mat_U = matU, mat_F = matF, sample_size = 10, FUN = popbio::lambda ) # Example of use to calculate 95% CI of generation time compute_ci( mat_U = matU, mat_F = matF, sample_size = 40, FUN = popbio::generation.time ) # Example of use to calculate 95% CI of generation time and show the # distribution of those bootstrapped estimates xx <- compute_ci( mat_U = matU, mat_F = matF, sample_size = 100, FUN = popbio::generation.time, dist.out = TRUE ) summary(xx$quantiles) hist(xx$estimates)set.seed(42) # set seed for repeatability # Data for use in example matU <- matrix(c( 0.1, 0.0, 0.2, 0.4 ), byrow = TRUE, nrow = 2) matF <- matrix(c( 0.0, 5.0, 0.0, 0.0 ), byrow = TRUE, nrow = 2) set.seed(42) # Example of use to calculate 95% CI of lambda compute_ci( mat_U = matU, mat_F = matF, sample_size = 10, FUN = popbio::lambda ) # Example of use to calculate 95% CI of generation time compute_ci( mat_U = matU, mat_F = matF, sample_size = 40, FUN = popbio::generation.time ) # Example of use to calculate 95% CI of generation time and show the # distribution of those bootstrapped estimates xx <- compute_ci( mat_U = matU, mat_F = matF, sample_size = 100, FUN = popbio::generation.time, dist.out = TRUE ) summary(xx$quantiles) hist(xx$estimates)
This function computes the 95% confidence interval for measures derived from
the U submatrix of a matrix population model using parametric bootstrapping.
In this approach a sampling distribution of the U submatrix is generated by
taking a large number of random independent draws using the sampling
distribution of each underlying transition rate. The approach rests on our
assumption that survival-related processes are binomial (see the function
add_mpm_error() for details).
compute_ci_U(mat_U, sample_size, FUN, ..., n_sim = 1000, dist.out = FALSE)compute_ci_U(mat_U, sample_size, FUN, ..., n_sim = 1000, dist.out = FALSE)
mat_U |
A matrix that describes the growth and survival process. |
sample_size |
either (1) a single matrix of sample sizes for each element of the U matrix, (2) a single value applied to the whole matrix |
FUN |
A function to apply to each simulated matrix population model.
This function must take, as input, a single U submatrix of a matrix
population model (i.e., the U matrix). For functions that require the A
matrix, use |
... |
Additional arguments to be passed to |
n_sim |
An integer indicating the number of simulations to run. Default is 1000. |
dist.out |
Logical. If TRUE, returns a list with both the quantiles and the simulated estimates. Default is FALSE. |
The main inputs is the U matrix, which describes the survival-related processes. The underlying assumption is that the U matrix is the average of a binomial process. The confidence interval will depend largely on the sample size used.
If dist.out is FALSE, a numeric vector of the 2.5th and 97.5th
quantiles of the estimated measures. If dist.out = TRUE, a list with two
elements: quantiles and estimates. quantiles is a numeric vector of
the 2.5th and 97.5th quantiles of the estimated measures, and estimates
is a numeric vector of the estimated measures.
Owen Jones [email protected]
Chapter 12 in Caswell, H. (2001). Matrix Population Models. Sinauer Associates Incorporated.
Other errors:
add_mpm_error(),
calculate_errors(),
compute_ci()
set.seed(42) # set seed for repeatability # Data for use in example matU <- matrix(c( 0.1, 0.0, 0.2, 0.4 ), byrow = TRUE, nrow = 2) # Example of use to calculate 95% CI of life expectancy compute_ci_U( mat_U = matU, sample_size = 10, FUN = Rage::life_expect_mean ) # Example of use to calculate 95% CI of generation time and show the # distribution of those bootstrapped estimates xx <- compute_ci_U( mat_U = matU, sample_size = 100, FUN = Rage::life_expect_mean, dist.out = TRUE ) summary(xx$quantiles) hist(xx$estimates)set.seed(42) # set seed for repeatability # Data for use in example matU <- matrix(c( 0.1, 0.0, 0.2, 0.4 ), byrow = TRUE, nrow = 2) # Example of use to calculate 95% CI of life expectancy compute_ci_U( mat_U = matU, sample_size = 10, FUN = Rage::life_expect_mean ) # Example of use to calculate 95% CI of generation time and show the # distribution of those bootstrapped estimates xx <- compute_ci_U( mat_U = matU, sample_size = 100, FUN = Rage::life_expect_mean, dist.out = TRUE ) summary(xx$quantiles) hist(xx$estimates)
This function calculates new values for a vital rate, such as survival or fecundity that is being influenced by a driver (e.g., weather). It does this by using a driver variable and a baseline value, along with a specified slope for the relationship between the driver variable and the vital rate. The function works on a linearised scale, using logit for survival and log for fecundity, and takes into account the error standard deviation.
driven_vital_rate( driver, baseline_value = NULL, slope = NULL, baseline_driver = NULL, error_sd = 0, link = "logit" )driven_vital_rate( driver, baseline_value = NULL, slope = NULL, baseline_driver = NULL, error_sd = 0, link = "logit" )
driver |
A vector of driver values. |
baseline_value |
A vector or matrix of baseline values for the vital rate (e.g., survival) that is being influenced ("driven") by another variable (e.g. a climatic variable). |
slope |
A vector or matrix of slopes for the relationship between the driver variable and the vital rate being driven. |
baseline_driver |
The |
error_sd |
A vector or matrix of error standard deviations for random normal error to be added to the driven value of the vital rate being modelled. If set to 0 (the default), no error is added. |
link |
A character string indicating the type of link function to use.
Valid values are " |
The relationship between the driver variable and the vital rate is assumed to be linear:
$$V = a * (d - d_b) + x + E$$
Where $$V$$ is the new vital rate (on the scale of the linear predictor), $$a$$ is the slope, $$x$$ is the baseline vital rate, $$d$$ is the driver, $$d_b$$ is the baseline driver and $$E$$ is the error.
The input vital rate(s) (baseline_value) can be a single-element vector
representing a single vital rate (e.g., survival probability or fecundity), a
longer vector representing a series of vital rates (e.g., several survival
probabilities or fecundity values), or a matrix of values (e.g., a U or F
submatrix of a matrix population model). The slopes of the relationship
between the vital rate (baseline_value) and the driver can be provided as a
single value, which is applied to all elements of the input vital rates, or
as a matrix of values that map onto the matrix of vital rates. This allows
users to simulate cases where different vital rates in a matrix model are
affected in different ways by the same weather driver. For example, juvenile
survival might be more affected by the driver than adult survival. The
baseline_driver value represents the "normal" state of the driver. If the
driver is greater than the baseline_driver and the slope is positive,
then the outcome vital rate will be higher. If the driver is less than the
baseline_driver variable and the slope is positive, then the outcome
vital rate will be less than the baseline_value. The error_sd represents
the error in the linear relationship between the driver and the vital rate.
Depending on the input types, either a single value, a vector or a
list of matrices of driven values for the vital rate(s) being modelled. The
list has a length equal to the length of the driver input parameter.
Owen Jones [email protected]
set.seed(42) # set seed for repeatability # A single vital rate and a single driver driven_vital_rate( driver = 14, baseline_value = 0.5, slope = .4, baseline_driver = 10, error_sd = 0, link = "logit" ) # A single vital rate and a time series of drivers driven_vital_rate( driver = runif(10, 5, 15), baseline_value = 0.5, slope = .4, baseline_driver = 10, error_sd = 0, link = "logit" ) # A matrix of survival values (U submatrix of a Leslie model) # with a series of drivers, and matrices of slopes and errors lt1 <- model_survival(params = c(b_0 = 0.4, b_1 = 0.5), model = "Gompertz") lt1$fert <- model_fertility( age = 0:max(lt1$x), params = c(A = 10), maturity = 3, model = "step" ) mats <- make_leslie_mpm( survival = lt1$px, fertility = lt1$fert, n_stages = nrow(lt1), split = TRUE ) mats$mat_U mat_dim <- nrow(mats$mat_U) driven_vital_rate( driver = runif(5, 5, 15), baseline_value = mats$mat_U, slope = matrix(.4, nrow = mat_dim, ncol = mat_dim ), baseline_driver = 10, error_sd = matrix(1, nrow = mat_dim, ncol = mat_dim), link = "logit" )set.seed(42) # set seed for repeatability # A single vital rate and a single driver driven_vital_rate( driver = 14, baseline_value = 0.5, slope = .4, baseline_driver = 10, error_sd = 0, link = "logit" ) # A single vital rate and a time series of drivers driven_vital_rate( driver = runif(10, 5, 15), baseline_value = 0.5, slope = .4, baseline_driver = 10, error_sd = 0, link = "logit" ) # A matrix of survival values (U submatrix of a Leslie model) # with a series of drivers, and matrices of slopes and errors lt1 <- model_survival(params = c(b_0 = 0.4, b_1 = 0.5), model = "Gompertz") lt1$fert <- model_fertility( age = 0:max(lt1$x), params = c(A = 10), maturity = 3, model = "step" ) mats <- make_leslie_mpm( survival = lt1$px, fertility = lt1$fert, n_stages = nrow(lt1), split = TRUE ) mats$mat_U mat_dim <- nrow(mats$mat_U) driven_vital_rate( driver = runif(5, 5, 15), baseline_value = mats$mat_U, slope = matrix(.4, nrow = mat_dim, ncol = mat_dim ), baseline_driver = 10, error_sd = matrix(1, nrow = mat_dim, ncol = mat_dim), link = "logit" )
This function is deprecated. Use rand_lefko_set instead.
generate_mpm_set( n = 10, n_stages = 3, archetype = 1, fecundity = 1.5, split = TRUE, by_type = TRUE, as_compadre = TRUE, max_surv = 0.99, constraint = NULL, attempts = 1000 )generate_mpm_set( n = 10, n_stages = 3, archetype = 1, fecundity = 1.5, split = TRUE, by_type = TRUE, as_compadre = TRUE, max_surv = 0.99, constraint = NULL, attempts = 1000 )
n |
The number of MPMs to generate. Default is 10. |
n_stages |
The number of stages for the MPMs. Default is 3. |
archetype |
The archetype of the MPMs. Default is 1. |
fecundity |
A vector of fecundities for the MPMs. Default is 1.5. |
split |
A logical indicating whether to split into submatrices. Default is TRUE. |
by_type |
A logical indicating whether the matrices should be returned
in a list by type (A, U, F, C). If split is |
as_compadre |
A logical indicating whether the matrices should be
returned as a |
max_surv |
The maximum acceptable survival value, calculated across all
transitions from a stage. Defaults to 0.99. This is only used if |
constraint |
An optional data frame with 4 columns named |
attempts |
An integer indicating the number of attempts To be made when simulating matrix model. The default is 1000. If it takes more than 1000 attempts to make a matrix that satisfies the conditions set by the other arguments, then a warning is produced. |
This function generates a list of n MPMs according to the specified
criteria. Criteria include the archetype, and the acceptable constraining
criteria, which could include lambda, generation time or any other metric
derived from an A matrix.
The function attempts to find matrices that fulfil the criteria, discarding
unacceptable matrices. By default, if it takes more than 1000 attempts to
find a suitable matrix model, then an error is produced. However, the number
of attempts can be altered with the attempts parameter.
A list of MPMs that meet the specified criteria.
Owen Jones [email protected]
random_mpm() which this function is essentially a wrapper for.
Other Lefkovitch matrices:
rand_lefko_mpm(),
rand_lefko_set(),
random_mpm()
set.seed(42) # set seed for repeatability # Basic operation, without splitting matrices and with no constraints generate_mpm_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, split = FALSE, by_type = FALSE, as_compadre = FALSE ) # Constrain outputs to A matrices with lambda between 0.9 and 1.1 library(popbio) constrain_df <- data.frame( fun = "lambda", arg = NA, lower = 0.9, upper = 1.1 ) generate_mpm_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, as_compadre = FALSE ) # As above, but using popdemo::eigs function instead of popbio::lambda # to illustrate use of argument library(popdemo) constrain_df <- data.frame( fun = "eigs", arg = "lambda", lower = 0.9, upper = 1.1 ) generate_mpm_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, as_compadre = FALSE ) # Multiple constraints # Constrain outputs to A matrices with lambda between 0.9 and 1.1, generation # time between 3 and 5 and damping ratio between 1 and 7. library(popbio) constrain_df <- data.frame( fun = c("lambda", "generation.time", "damping.ratio"), arg = c(NA, NA, NA), lower = c(0.9, 3.0, 1.0), upper = c(1.1, 5.0, 7.0) ) generate_mpm_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, as_compadre = FALSE )set.seed(42) # set seed for repeatability # Basic operation, without splitting matrices and with no constraints generate_mpm_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, split = FALSE, by_type = FALSE, as_compadre = FALSE ) # Constrain outputs to A matrices with lambda between 0.9 and 1.1 library(popbio) constrain_df <- data.frame( fun = "lambda", arg = NA, lower = 0.9, upper = 1.1 ) generate_mpm_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, as_compadre = FALSE ) # As above, but using popdemo::eigs function instead of popbio::lambda # to illustrate use of argument library(popdemo) constrain_df <- data.frame( fun = "eigs", arg = "lambda", lower = 0.9, upper = 1.1 ) generate_mpm_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, as_compadre = FALSE ) # Multiple constraints # Constrain outputs to A matrices with lambda between 0.9 and 1.1, generation # time between 3 and 5 and damping ratio between 1 and 7. library(popbio) constrain_df <- data.frame( fun = c("lambda", "generation.time", "damping.ratio"), arg = c(NA, NA, NA), lower = c(0.9, 3.0, 1.0), upper = c(1.1, 5.0, 7.0) ) generate_mpm_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, as_compadre = FALSE )
The function creates a Leslie matrix from inputs of number of stages, fertility (the top row of the matrix), and survival probability (the value in the sub-diagonal).
make_leslie_mpm( survival = NULL, fertility = NULL, n_stages = NULL, lifetable = NULL, split = FALSE )make_leslie_mpm( survival = NULL, fertility = NULL, n_stages = NULL, lifetable = NULL, split = FALSE )
survival |
a numeric value representing the survival probability of each stage along the lower off-diagonal of the matrix, with the final value being in the lower-right corner of the matrix. If only one value is provided, this is applied to all survival elements. |
fertility |
a numeric vector of length n_stages representing the fertility rate of each stage. If only one value is provided, this is applied to all fertility elements. |
n_stages |
a numeric value representing the number of stages in the matrix |
lifetable |
a life table containing columns |
split |
a logical argument indicating whether the output matrix should be split into separate A, U and F matrices (where A = U + F). |
A matrix of size n_stages x n_stages representing the Leslie matrix
Owen Jones [email protected]
Caswell, H. (2001). Matrix Population Models: Construction, Analysis, and Interpretation. Sinauer.
Leslie, P. H. (1945). On the use of matrices in certain population mathematics. Biometrika, 33 (3), 183–212.
Leslie, P. H. (1948). Some Further Notes on the Use of Matrices in Population Mathematics. Biometrika, 35(3-4), 213–245.
model_survival() to model age-specific survival using mortality models.
model_fertility() to model age-specific fertility using various
functions.
Other Leslie matrices:
rand_leslie_set(),
reorganise_matrices()
make_leslie_mpm( survival = 0.5, fertility = c(0.1, 0.2, 0.3), n_stages = 3, split = FALSE ) make_leslie_mpm( survival = c(0.5, 0.6, 0.7), fertility = c(0.1, 0.2, 0.3), n_stages = 3 ) make_leslie_mpm( survival = seq(0.1, 0.7, length.out = 4), fertility = 0.1, n_stages = 4 ) make_leslie_mpm( survival = c(0.8, 0.3, 0.2, 0.1, 0.05), fertility = 0.2, n_stages = 5 )make_leslie_mpm( survival = 0.5, fertility = c(0.1, 0.2, 0.3), n_stages = 3, split = FALSE ) make_leslie_mpm( survival = c(0.5, 0.6, 0.7), fertility = c(0.1, 0.2, 0.3), n_stages = 3 ) make_leslie_mpm( survival = seq(0.1, 0.7, length.out = 4), fertility = 0.1, n_stages = 4 ) make_leslie_mpm( survival = c(0.8, 0.3, 0.2, 0.1, 0.05), fertility = 0.2, n_stages = 5 )
This function computes fertility based on the logistic, step, von Bertalanffy, Hadwiger, and normal models. The logistic model assumes that fertility increases sigmoidally with age from maturity until a maximum fertility is reached. The step model assumes that fertility is zero before the age of maturity and then remains constant. The von Bertalanffy model assumes that, after maturity, fertility increases asymptotically with age until a maximum fertility is reached. In this formulation, the model is set up so that fertility is 0 at the 'age of maturity - 1', and increases from that point. The Hadwiger model is rather complex and is intended to model human fertility with a characteristic hump-shaped fertility. For all models, the output ensures that fertility is zero before the age at maturity.
model_fertility(params, age = NULL, maturity = 0, model = "logistic")model_fertility(params, age = NULL, maturity = 0, model = "logistic")
params |
A numeric vector of parameters for the selected model. The number and meaning of parameters depend on the selected model. |
age |
A numeric vector representing age. For use in creation of MPMs and life tables, these should be integers. |
maturity |
A non-negative numeric value indicating the age at maturity. Whatever model is used, the fertility is forced to be 0 below the age of maturity. |
model |
A character string specifying the model to use. Must be one of "logistic", "step", "vonbertalanffy","normal" or "hadwiger". |
The required parameters varies depending on the fertility model. The parameters are provided as a vector and the parameters must be provided in the order mentioned here.
Logistic:
Step:
von Bertalanffy:
Normal:
Hadwiger:
A numeric vector representing the computed fertility values.
Owen Jones [email protected]
Bertalanffy, L. von (1938) A quantitative theory of organic growth (inquiries on growth laws. II). Human Biology 10:181–213.
Peristera, P. & Kostaki, A. (2007) Modeling fertility in modern populations. Demographic Research. 16. Article 6, 141-194 doi:10.4054/DemRes.2007.16.6
model_mortality() to model age-specific survival using mortality
models.
Other trajectories:
model_survival()
# Compute fertility using the step model model_fertility(age = 0:20, params = c(A = 10), maturity = 2, model = "step") # Compute fertility using the logistic model model_fertility( age = 0:20, params = c(A = 10, k = 0.5, x_m = 8), maturity = 0, model = "logistic" ) # Compute fertility using the von Bertalanffy model model_fertility( age = 0:20, params = c(A = 10, k = .3), maturity = 2, model = "vonbertalanffy" ) # Compute fertility using the normal model model_fertility( age = 0:20, params = c(A = 10, mu = 4, sd = 2), maturity = 0, model = "normal" ) # Compute fertility using the Hadwiger model model_fertility( age = 0:50, params = c(a = 0.91, b = 3.85, C = 29.78), maturity = 0, model = "hadwiger" )# Compute fertility using the step model model_fertility(age = 0:20, params = c(A = 10), maturity = 2, model = "step") # Compute fertility using the logistic model model_fertility( age = 0:20, params = c(A = 10, k = 0.5, x_m = 8), maturity = 0, model = "logistic" ) # Compute fertility using the von Bertalanffy model model_fertility( age = 0:20, params = c(A = 10, k = .3), maturity = 2, model = "vonbertalanffy" ) # Compute fertility using the normal model model_fertility( age = 0:20, params = c(A = 10, mu = 4, sd = 2), maturity = 0, model = "normal" ) # Compute fertility using the Hadwiger model model_fertility( age = 0:50, params = c(a = 0.91, b = 3.85, C = 29.78), maturity = 0, model = "hadwiger" )
Generates an actuarial life table based on a defined mortality model.
model_survival(params, age = NULL, model, truncate = 0.01) model_mortality(params, age = NULL, model, truncate = 0.01)model_survival(params, age = NULL, model, truncate = 0.01) model_mortality(params, age = NULL, model, truncate = 0.01)
params |
Numeric vector representing the parameters of the mortality model. |
age |
Numeric vector representing age. The default is |
model |
A character string specifying the name of the mortality model to
be used. Options are |
truncate |
a value defining how the life table output should be
truncated. The default is |
The required parameters varies depending on the mortality model. The parameters are provided as a vector.
*For gompertz and weibull, the
parameters are b0, b1.
*For gompertzmakeham and weibullmakeham the parameters are b0, b1
and C.
*For exponential, the parameter is C.
*For siler, the parameters are a0, a1, C, b0 and b1.
Note that the parameters must be provided in the order mentioned here. x
represents age.
Gompertz:
Gompertz-Makeham:
Exponential:
Siler:
Weibull:
Weibull-Makeham:
In the output, the probability of survival (px) (and death (qx))
represent the probability of individuals that enter the age interval
survive until the end of the interval (or die before the end
of the interval). It is not possible to estimate a value for this in the
final row of the life table (because there is no value) and
therefore the input values of age (x) may need to be extended to capture
this final interval.
A dataframe in the form of a lifetable with columns for age (x),
hazard (hx), survivorship (lx) and mortality (qx) and survival
probability within interval (px).
Owen Jones [email protected]
Cox, D.R. & Oakes, D. (1984) Analysis of Survival Data. Chapman and Hall, London, UK.
Pinder III, J.E., Wiener, J.G. & Smith, M.H. (1978) The Weibull distribution: a method of summarizing survivorship data. Ecology, 59, 175–179.
Pletcher, S. (1999) Model fitting and hypothesis testing for age-specific mortality data. Journal of Evolutionary Biology, 12, 430–439.
Siler, W. (1979) A competing-risk model for animal mortality. Ecology, 60, 750–757.
Vaupel, J., Manton, K. & Stallard, E. (1979) The impact of heterogeneity in individual frailty on the dynamics of mortality. Demography, 16, 439–454.
model_fertility() to model age-specific fertility using various
functions.
Other trajectories:
model_fertility()
model_mortality(params = c(b_0 = 0.1, b_1 = 0.2), model = "Gompertz") model_mortality( params = c(b_0 = 0.1, b_1 = 0.2, C = 0.1), model = "GompertzMakeham", truncate = 0.1 ) model_mortality(params = c(c = 0.2), model = "Exponential", age = 0:10) model_mortality( params = c(a_0 = 0.1, a_1 = 0.2, C = 0.1, b_0 = 0.1, b_1 = 0.2), model = "Siler", age = 0:10 ) model_mortality( params = c(b_0 = 1.4, b_1 = 0.18), model = "Weibull" ) model_mortality( params = c(b_0 = 1.1, b_1 = 0.05, c = 0.2), model = "WeibullMakeham" ) model_mortality(params = c(b_0 = 0.1, b_1 = 0.2), model = "Gompertz")model_mortality(params = c(b_0 = 0.1, b_1 = 0.2), model = "Gompertz") model_mortality( params = c(b_0 = 0.1, b_1 = 0.2, C = 0.1), model = "GompertzMakeham", truncate = 0.1 ) model_mortality(params = c(c = 0.2), model = "Exponential", age = 0:10) model_mortality( params = c(a_0 = 0.1, a_1 = 0.2, C = 0.1, b_0 = 0.1, b_1 = 0.2), model = "Siler", age = 0:10 ) model_mortality( params = c(b_0 = 1.4, b_1 = 0.18), model = "Weibull" ) model_mortality( params = c(b_0 = 1.1, b_1 = 0.05, c = 0.2), model = "WeibullMakeham" ) model_mortality(params = c(b_0 = 0.1, b_1 = 0.2), model = "Gompertz")
Visualise a matrix, such as a matrix population model (MPM), as a heatmap.
plot_matrix(mat, zero_na = FALSE, legend = FALSE, na_colour = NA, ...)plot_matrix(mat, zero_na = FALSE, legend = FALSE, na_colour = NA, ...)
mat |
A matrix, such as the A matrix of a matrix population model |
zero_na |
Logical indicating whether zero values should be treated as NA |
legend |
Logical indicating whether to include a legend |
na_colour |
Colour for NA values |
... |
Additional arguments to be passed to ggplot |
A ggplot object
Owen Jones [email protected]
Other utility:
summarise_mpms()
matDim <- 10 A1 <- make_leslie_mpm( survival = seq(0.1, 0.7, length.out = matDim), fertility = seq(0.1, 0.7, length.out = matDim), n_stages = matDim ) plot_matrix(A1, zero_na = TRUE, na_colour = "black") plot_matrix(A1, zero_na = TRUE, na_colour = NA)matDim <- 10 A1 <- make_leslie_mpm( survival = seq(0.1, 0.7, length.out = matDim), fertility = seq(0.1, 0.7, length.out = matDim), n_stages = matDim ) plot_matrix(A1, zero_na = TRUE, na_colour = "black") plot_matrix(A1, zero_na = TRUE, na_colour = NA)
Generates a random matrix population model (MPM) with element values based on defined life history archetypes. Survival and transition/growth probabilities from any particular stage are restricted to be less than or equal to 1 by drawing from a Dirichlet distribution. The user can specify archetypes (from Takada et al. 2018) to restrict the MPMs in other ways:
Archetype 1: all elements are positive, although they may be very small. Therefore, transition from/to any stage is possible. This model describes a life history where individuals can progress and retrogress rapidly.
Archetype 2: has the same form as archetype 1 (transition from/to any stage is possible), but the survival probability (column sums of the survival matrix) increases monotonously as the individuals advance to later stages. This model, as the one in the first archetype, also allows for rapid progression and retrogression, but is more realistic in that stage-specific survival probability increases with stage advancement.
Archetype 3: positive non-zero elements for survival are only allowed on the diagonal and lower sub-diagonal of the matrix This model represents the life cycle of a species where retrogression is not allowed, and progression can only happen to the immediately larger/more developed stage (slow progression, e.g., trees).
Archetype 4: This archetype has the same general form as archetype 3, but with the further assumption that stage-specific survival increases as individuals increase in size/developmental stage. In this respect it is similar to archetype 2.
rand_lefko_mpm(n_stages, fecundity, archetype = 1, split = TRUE)rand_lefko_mpm(n_stages, fecundity, archetype = 1, split = TRUE)
n_stages |
An integer defining the number of stages for the MPM. |
fecundity |
Fecundity is the average number of offspring produced. Values can be provided in 4 ways:
In the latter case, a fecundity value will be drawn from a uniform distribution for the defined range. If there is no reproduction in a particular age class, use a value of 0 for both the lower and upper limit. |
archetype |
Indication of which life history archetype should be used, based on Takada et al. 2018. An integer between 1 and 4. |
split |
|
In all 4 of these Archetypes, fecundity is placed as a single element on the
top right of the matrix, if it is a single value. If it is a vector of length
n_stages then the fertility vector spans the entire top row of the matrix.
The function is constrained to only output ergodic matrices.
Returns a random matrix population model with characteristics determined by the archetype selected and fecundity vector. If split = TRUE, the matrix is split into separate fertility and a growth/survival matrices, returned as a list.
Owen Jones [email protected]
Caswell, H. (2001). Matrix Population Models: Construction, Analysis, and Interpretation. Sinauer.
Lefkovitch, L. P. (1965). The study of population growth in organisms grouped by stages. Biometrics, 21(1), 1.
Takada, T., Kawai, Y., & Salguero-Gómez, R. (2018). A cautionary note on elasticity analyses in a ternary plot using randomly generated population matrices. Population Ecology, 60(1), 37–47.
rand_lefko_set() which is a wrapper for this function allowing the
generation of large numbers of random matrices of this type.
Other Lefkovitch matrices:
generate_mpm_set(),
rand_lefko_set(),
random_mpm()
set.seed(42) # set seed for repeatability rand_lefko_mpm(n_stages = 2, fecundity = 20, archetype = 1, split = FALSE) rand_lefko_mpm(n_stages = 2, fecundity = 20, archetype = 2, split = TRUE) rand_lefko_mpm(n_stages = 3, fecundity = 20, archetype = 3, split = FALSE) rand_lefko_mpm(n_stages = 4, fecundity = 20, archetype = 4, split = TRUE) rand_lefko_mpm( n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, split = TRUE ) # Using a range of values for fecundity rand_lefko_mpm(n_stages = 2, fecundity = 20, archetype = 1, split = TRUE)set.seed(42) # set seed for repeatability rand_lefko_mpm(n_stages = 2, fecundity = 20, archetype = 1, split = FALSE) rand_lefko_mpm(n_stages = 2, fecundity = 20, archetype = 2, split = TRUE) rand_lefko_mpm(n_stages = 3, fecundity = 20, archetype = 3, split = FALSE) rand_lefko_mpm(n_stages = 4, fecundity = 20, archetype = 4, split = TRUE) rand_lefko_mpm( n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, split = TRUE ) # Using a range of values for fecundity rand_lefko_mpm(n_stages = 2, fecundity = 20, archetype = 1, split = TRUE)
This function generates a list of n MPMs according to the specified
criteria. Criteria include the archetype, and the acceptable constraining
criteria, which could include lambda, generation time or any other metric
derived from an A matrix. The function attempts to find matrices that fulfil
the criteria, discarding unacceptable matrices. By default, if it takes more
than 1000 attempts to find a suitable matrix model, then an error is
produced. However, the number of attempts can be altered with the attempts
parameter.
rand_lefko_set( n_models = 5, n_stages = 3, archetype = 1, fecundity = 1.5, output = "Type1", max_surv = 0.99, constraint = NULL, attempts = 1000 )rand_lefko_set( n_models = 5, n_stages = 3, archetype = 1, fecundity = 1.5, output = "Type1", max_surv = 0.99, constraint = NULL, attempts = 1000 )
n_models |
An integer indicating the number of MPMs to generate. |
n_stages |
The number of stages for the MPMs. Default is |
archetype |
The archetype of the MPMs. Default is |
fecundity |
Fecundity is the average number of offspring produced. Values can be provided in 4 ways:
In the latter case, a fecundity value will be drawn from a uniform distribution for the defined range. If there is no reproduction in a particular age class, use a value of 0 for both the lower and upper limit. |
output |
Character string indicating the type of output.
|
max_surv |
The maximum acceptable survival value, calculated across all
transitions from a stage. Defaults to |
constraint |
An optional data frame with 4 columns named |
attempts |
An integer indicating the number of attempts To be made when simulating matrix model. The default is 1000. If it takes more than 1000 attempts to make a matrix that satisfies the conditions set by the other arguments, then a warning is produced. |
A compadreDB object or list of MPMs that meet the specified
criteria.
Owen Jones [email protected]
Caswell, H. (2001). Matrix Population Models: Construction, Analysis, and Interpretation. Sinauer.
Lefkovitch, L. P. (1965). The study of population growth in organisms grouped by stages. Biometrics, 21(1), 1.
Takada, T., Kawai, Y., & Salguero-Gómez, R. (2018). A cautionary note on elasticity analyses in a ternary plot using randomly generated population matrices. Population Ecology, 60(1), 37–47.
rand_lefko_mpm() which this function is essentially a wrapper for.
Other Lefkovitch matrices:
generate_mpm_set(),
rand_lefko_mpm(),
random_mpm()
set.seed(42) # set seed for repeatability # Basic operation, without splitting matrices and with no constraints rand_lefko_set( n_models = 3, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, output = "Type5" ) # Constrain outputs to A matrices with lambda between 0.9 and 1.1 library(popbio) constrain_df <- data.frame( fun = "lambda", arg = NA, lower = 0.9, upper = 1.1 ) rand_lefko_set( n_models = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, output = "Type5" ) # As above, but using popdemo::eigs function instead of popbio::lambda # to illustrate use of argument library(popdemo) constrain_df <- data.frame( fun = "eigs", arg = "lambda", lower = 0.9, upper = 1.1 ) rand_lefko_set( n_models = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, output = "Type5" ) # Multiple constraints # Constrain outputs to A matrices with lambda between 0.9 and 1.1, generation # time between 3 and 5 and damping ratio between 1 and 7. library(popbio) constrain_df <- data.frame( fun = c("lambda", "generation.time", "damping.ratio"), arg = c(NA, NA, NA), lower = c(0.9, 3.0, 1.0), upper = c(1.1, 5.0, 7.0) ) rand_lefko_set( n_models = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, output = "Type5" )set.seed(42) # set seed for repeatability # Basic operation, without splitting matrices and with no constraints rand_lefko_set( n_models = 3, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, output = "Type5" ) # Constrain outputs to A matrices with lambda between 0.9 and 1.1 library(popbio) constrain_df <- data.frame( fun = "lambda", arg = NA, lower = 0.9, upper = 1.1 ) rand_lefko_set( n_models = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, output = "Type5" ) # As above, but using popdemo::eigs function instead of popbio::lambda # to illustrate use of argument library(popdemo) constrain_df <- data.frame( fun = "eigs", arg = "lambda", lower = 0.9, upper = 1.1 ) rand_lefko_set( n_models = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, output = "Type5" ) # Multiple constraints # Constrain outputs to A matrices with lambda between 0.9 and 1.1, generation # time between 3 and 5 and damping ratio between 1 and 7. library(popbio) constrain_df <- data.frame( fun = c("lambda", "generation.time", "damping.ratio"), arg = c(NA, NA, NA), lower = c(0.9, 3.0, 1.0), upper = c(1.1, 5.0, 7.0) ) rand_lefko_set( n_models = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, constraint = constrain_df, output = "Type5" )
Generates a set of Leslie matrix population models (MPMs) based on defined mortality and fertility models, and using model parameters randomly drawn from specified distributions.
rand_leslie_set( n_models = 5, mortality_model = "gompertz", fertility_model = "step", mortality_params, fertility_params, fertility_maturity_params, dist_type = "uniform", output = "type1", scale_output = FALSE )rand_leslie_set( n_models = 5, mortality_model = "gompertz", fertility_model = "step", mortality_params, fertility_params, fertility_maturity_params, dist_type = "uniform", output = "type1", scale_output = FALSE )
n_models |
An integer indicating the number of MPMs to generate. |
mortality_model |
A character string specifying the name of the
mortality model to be used. Options are |
fertility_model |
A character string specifying the name of the
fertility model to be used. Options are |
mortality_params |
A two-column dataframe with a number of rows equal to
the number of parameters in the mortality model. The required order of the
parameters depends on the selected
|
fertility_params |
A two-column dataframe with a number of rows equal to
the number of parameters in the fertility model. The required order of the
parameters depends on the selected
|
fertility_maturity_params |
A vector with two elements defining the
distribution from which age at maturity is drawn for the models. The models
will coerce fertility to be zero before this point. If |
dist_type |
A character string specifying the type of distribution to
draw parameters from. Default is |
output |
Character string indicating the type of output. Output can be one of the following types:
|
scale_output |
A logical argument. If |
Returns a CompadreDB object or list containing MPMs or life
tables generated using the specified model with parameters drawn from
random uniform or normal distributions. The format of the output MPMs
depends on the arguments output. Outputs may optionally be scaled using
the argument scale_output to ensure a population growth rate (lambda) of
1.
If the output is a CompadreDB object, the parameters of the models used
to produce the MPM are included in the metadata.
Owen Jones [email protected]
Other Leslie matrices:
make_leslie_mpm(),
reorganise_matrices()
mortParams <- data.frame( minVal = c(0, 0.01, 0.1), maxVal = c(0.14, 0.15, 0.1) ) fertParams <- data.frame( minVal = c(10, 0.5, 8), maxVal = c(11, 0.9, 10) ) maturityParam <- c(0, 0) rand_leslie_set( n_models = 5, mortality_model = "gompertzmakeham", fertility_model = "normal", mortality_params = mortParams, fertility_params = fertParams, fertility_maturity_params = maturityParam, dist_type = "uniform", output = "Type1" )mortParams <- data.frame( minVal = c(0, 0.01, 0.1), maxVal = c(0.14, 0.15, 0.1) ) fertParams <- data.frame( minVal = c(10, 0.5, 8), maxVal = c(11, 0.9, 10) ) maturityParam <- c(0, 0) rand_leslie_set( n_models = 5, mortality_model = "gompertzmakeham", fertility_model = "normal", mortality_params = mortParams, fertility_params = fertParams, fertility_maturity_params = maturityParam, dist_type = "uniform", output = "Type1" )
This function is deprecated. Use rand_lefko_mpm instead.
random_mpm(n_stages, fecundity, archetype = 1, split = FALSE)random_mpm(n_stages, fecundity, archetype = 1, split = FALSE)
n_stages |
An integer defining the number of stages for the MPM. |
fecundity |
Fecundity is the average number of offspring produced. Values can be provided in 4 ways:
|
archetype |
Indication of which life history archetype should be used, based on Takada et al. 2018. An integer between 1 and 4. |
split |
TRUE/FALSE, indicating whether the matrix produced should be split into a survival matrix and a fertility matrix. Yeah true, then the output becomes a list with a matrix in each element. Otherwise, the output is a single matrix. |
Generates a random matrix population model (MPM) with element values based on defined life history archetypes. Survival and transition/growth probabilities from any particular stage are restricted to be less than or equal to 1 by drawing from a Dirichlet distribution. The user can specify archetypes (from Takada et al. 2018) to restrict the MPMs in other ways:
Archetype 1: all elements are positive, although they may be very small. Therefore, transition from/to any stage is possible. This model describes a life history where individuals can progress and retrogress rapidly.
Archetype 2: has the same form as archetype 1 (transition from/to any stage is possible), but the survival probability (column sums of the survival matrix) increases monotonously as the individuals advance to later stages. This model, as the one in the first archetype, also allows for rapid progression and retrogression, but is more realistic in that stage-specific survival probability increases with stage advancement.
Archetype 3: positive non-zero elements for survival are only allowed on the diagonal and lower sub-diagonal of the matrix This model represents the life cycle of a species where retrogression is not allowed, and progression can only happen to the immediately larger/more developed stage (slow progression, e.g., trees).
Archetype 4: This archetype has the same general form as archetype 3, but with the further assumption that stage-specific survival increases as individuals increase in size/developmental stage. In this respect it is similar to archetype 2.
In all 4 of these Archetypes, fecundity is placed as a single element on the
top right of the matrix, if it is a single value. If it is a vector of length
n_stages then the fertility vector spans the entire top row of the matrix.
The function is constrained to only output ergodic matrices.
Returns a random matrix population model with characteristics determined by the archetype selected and fecundity vector. If split = TRUE, the matrix is split into separate fertility and a growth/survival matrices, returned as a list.
Owen Jones [email protected]
Caswell, H. (2001). Matrix Population Models: Construction, Analysis, and Interpretation. Sinauer.
Lefkovitch, L. P. (1965). The study of population growth in organisms grouped by stages. Biometrics, 21(1), 1.
Takada, T., Kawai, Y., & Salguero-Gómez, R. (2018). A cautionary note on elasticity analyses in a ternary plot using randomly generated population matrices. Population Ecology, 60(1), 37–47.
generate_mpm_set() which is a wrapper for this function allowing
the generation of large numbers of random matrices of this type.
Other Lefkovitch matrices:
generate_mpm_set(),
rand_lefko_mpm(),
rand_lefko_set()
set.seed(42) # set seed for repeatability random_mpm(n_stages = 2, fecundity = 20, archetype = 1, split = FALSE) random_mpm(n_stages = 2, fecundity = 20, archetype = 2, split = TRUE) random_mpm(n_stages = 3, fecundity = 20, archetype = 3, split = FALSE) random_mpm(n_stages = 4, fecundity = 20, archetype = 4, split = TRUE) random_mpm( n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, split = TRUE ) # Using a range of values for fecundity random_mpm(n_stages = 2, fecundity = 20, archetype = 1, split = TRUE)set.seed(42) # set seed for repeatability random_mpm(n_stages = 2, fecundity = 20, archetype = 1, split = FALSE) random_mpm(n_stages = 2, fecundity = 20, archetype = 2, split = TRUE) random_mpm(n_stages = 3, fecundity = 20, archetype = 3, split = FALSE) random_mpm(n_stages = 4, fecundity = 20, archetype = 4, split = TRUE) random_mpm( n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, split = TRUE ) # Using a range of values for fecundity random_mpm(n_stages = 2, fecundity = 20, archetype = 1, split = TRUE)
This function reorganises a list of matrix population models, which are split
into mat_A, mat_U, mat_F, and optionally mat_C
sub-matrices. It prepares the matrices for easy conversion into a
compadreDB object.
reorganise_matrices(matrix_list)reorganise_matrices(matrix_list)
matrix_list |
A list of lists, where each sub-list contains the matrices
|
This function processes a list of matrix population models,
extracting and grouping the sub-matrices (mat_A, mat_U,
mat_F, and optionally mat_C) into separate lists. If a
mat_C matrix is not present in a model, an NA matrix of the
same size as mat_U is used as a placeholder.
A list containing four elements: mat_A, mat_U,
mat_F, and mat_C. Each element is a list of matrices
corresponding to the respective matrix type from the input. If mat_C
does not exist in a sub-list, it is replaced with an NA matrix of
the same dimensions as mat_U.
Owen Jones [email protected]
Other Leslie matrices:
make_leslie_mpm(),
rand_leslie_set()
# Example usage matrix_list <- list( list( mat_A = matrix(1, 2, 2), mat_U = matrix(2, 2, 2), mat_F = matrix(3, 2, 2), mat_C = matrix(4, 2, 2) ), list( mat_A = matrix(5, 2, 2), mat_U = matrix(6, 2, 2), mat_F = matrix(7, 2, 2) ) ) reorganised_matrices <- reorganise_matrices(matrix_list) reorganised_matrices$mat_A# Example usage matrix_list <- list( list( mat_A = matrix(1, 2, 2), mat_U = matrix(2, 2, 2), mat_F = matrix(3, 2, 2), mat_C = matrix(4, 2, 2) ), list( mat_A = matrix(5, 2, 2), mat_U = matrix(6, 2, 2), mat_F = matrix(7, 2, 2) ) ) reorganised_matrices <- reorganise_matrices(matrix_list) reorganised_matrices$mat_A
Calculates and summarises various metrics from matrix population models (MPMs) including dimension (= age in Leslie matrices), lambda values, maximum fecundity values, maximum growth/survival transition probabilities, and minimum non-zero growth/survival transition probabilities
summarise_mpms(x)summarise_mpms(x)
x |
A |
This function prints summaries of the following metrics:
lambda values: The lambda values (dominant eigenvalues) of the A matrices.
max F values: The maximum values from the F matrices.
max U values: The maximum values from the U matrices.
minimum non-zero U values: The minimum non-zero values from the U matrices.
Other utility:
plot_matrix()
mats <- rand_lefko_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, output = "Type1" ) summarise_mpms(mats)mats <- rand_lefko_set( n = 10, n_stages = 5, fecundity = c(0, 0, 4, 8, 10), archetype = 4, output = "Type1" ) summarise_mpms(mats)