Package 'iccde'

Bootstrap Confidence Intervals for Double-Entry Intraclass Correlations)

Description

For different applications, confidence intervals for the double- entry intraclass correlation can be useful. Bootstrap confidence intervals are computed by means of repeated resampling from the original data at hand.

Usage

icc.de.boot(data, n.sim = 1000, alpha = .05, digit = 3)

Arguments

data	A data frame with participants in rows and variables in columns. Users should restrict the data set to the variables of concrete interest because the all available information in the data frame will be used to compute bootstrapped confidence intervals. Thus, it is advisable to create a new data frame that entails only the variables on which the matrix of ICCDEs should be based. Computations in a data set with 56 variables on a Windows device (i5 CPU, 8 GB RAM) and a Macbook Pro (M3 Pro CPU, 36 GB RAM), for instance, took about two minutes, given 1,000 iterations.
n.sim	The number of iterations to be carried out. Default is 1,000.
alpha	Type I error. Default is .05.
digit	Number of digits in the output. Default is 3.

Value

The output provides a list of matrices of double-entry intraclass correlations.

Mean	A matrix of the bootstrapped point estimates of the bootstrapped double-entry intraclass correlations.
LL	A matrix providing the lower limits of the bootstrap confidence intervals, given the desired alpha level.
UL	A matrix providing the upper limits of the bootstrap confidence intervals, given the selected alpha level.

Author(s)

Christian Blötner, Michael Paul Grosz [email protected]

References

Furr, R. M. (2010). The Double-Entry Intraclass Correlation as an index of profile similarity: Meaning, limitations, and alternatives. Journal of Personality Assessment, 92(1), 1–15. <https://doi.org/10.1080/00223890903379134>

McCrae, R. R. (2008). A note on some measures of profile agreement. Journal of Personality Assessment, 90(2), 105–109. <https://doi.org/10.1080/00223890701845104>

Examples

df <- data.frame(a = rnorm(100), b = rnorm(100), c = rnorm(100),
                 x = rnorm(100), y = rnorm(100), z = rnorm(100))
icc.de.boot(data = df,
            n.sim = 1000,
            alpha = .01,
            digit = 2)

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Computation of Double-Entry Intraclass Correlations for correlation matrices

Description

This function computes pairwise double-entry intraclass correlations among all entries of a data frame. Correlations between the compared variables as well as correlations of the constructs with themselves are thereby excluded from the calculation (i.e., correlations between X and Y, correlation between X and X, and correlation between Y and Y).

Usage

icc.de.mat(data, digit)

Arguments

data	A data frame with participants in rows and variables in columns.
digit	Number of digits in the output. The default is 3.

Value

iccde

Double-Entry Intraclass Correlation

Author(s)

Christian Blötner, Michael Paul Grosz [email protected]

References

Furr, R. M. (2010). The Double-Entry Intraclass Correlation as an Index of Profile Similarity: Meaning, Limitations, and Alternatives. Journal of Personality Assessment, 92(1), 1–15. https://doi.org/10.1080/00223890903379134

McCrae, R. R. (2008). A Note on Some Measures of Profile Agreement. Journal of Personality Assessment, 90(2), 105–109. https://doi.org/10.1080/00223890701845104

Examples

df <- data.frame(a = rnorm(100), b = rnorm(100), c = rnorm(100),
                 x = rnorm(100), y = rnorm(100), z = rnorm(100))
icc.de.mat(df)

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Computation of the Double-Entry Intraclass Correlation between two profiles

Description

The function computes the double-entry intraclass correlation, which is an index of profile similarity (Furr, 2010; McCrae, 2008). The double-entry intraclass correlation is a more precise index of the agreement of two empirically observed profiles than the often-used intraclass correlation (McCrae, 2008). The function transforms profiles comprising correlations according to the Fisher z-transformation before the double-entry intraclass correlation is calculated. If the profiles comprise scores such as sum scores from various personality scales, it is recommended to standardize each individual score prior to computation of the double-entry intraclass correlation (McCrae, 2008). See Furr (2010) <doi:10.1080/00223890903379134> or McCrae (2008) <doi:10.1080/00223890701845104> for details.

Usage

icc.de(prof1, prof2, input = c("cor", "score"), digits = 2)

Arguments

prof1	Vector of components of the nomological network of the first trait (input = "cor") or vector of components of the first profile (input = "score").
prof2	Vector of components of the nomological network of the second trait (input = "cor") or vector of components of the second profile (input = "score").
input	Do the profiles contain correlations (e.g., from nomological network; input = "cor") or scores from different scales (e.g., sum scores from diverse personality tests; input = "score")? The default is input = "cor".
digits	Number of digits in the output. The default is digits = 2.

Value

iccde

Double-Entry Intraclass Correlation for two given profiles

Author(s)

Christian Blötner, Michael Paul Grosz [email protected]

References

Furr, R. M. (2010). The Double-Entry Intraclass Correlation as an Index of Profile Similarity: Meaning, Limitations, and Alternatives. Journal of Personality Assessment, 92(1), 1-15. https://doi.org/10.1080/00223890903379134

McCrae, R. R. (2008). A Note on Some Measures of Profile Agreement. Journal of Personality Assessment, 90(2), 105-109. https://doi.org/10.1080/00223890701845104

Examples

icc.de(prof1 = c(.59, .48, .23), prof2 = c(.52, .76, .22), input = "cor")

icc.de(prof1 = c(-1, -0.85, 2), prof2 = c(-0.93, 1, 1.26), input = "score",
digits = 4)

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