Package 'forecastsuite'

Description

Calendar dates (month-day) that are zero or missing in every year present – these look like de facto holidays/closures that were never declared, so a holiday-aware model can't account for them.

Usage

always_zero_dates(data, holidays = NULL)

Arguments

Value

A tibble with columns ds, flag ("Zero every year" or "Missing every year"), and declared_holiday (logical) – the undeclared rows are the actual gap.

Examples

data <- tibble::tibble(
  ds = c(as.Date("2023-01-01"), as.Date("2024-01-01"), as.Date("2023-06-01")),
  y = c(0, 0, 5)
)
always_zero_dates(data)

Description

A lightweight, no-model-fitting heuristic: measures trend/seasonal strength (via STL decomposition), differencing needed (forecast::ndiffs/nsdiffs), missing-data ratio, and a Box-Jenkins ACF/PACF-based (p,q)(P,Q) order suggestion. Feeds recommend_model()'s scoring and the app's suggested-hyperparameters table.

Usage

analyze_series(df, date_agg = "day", robust = FALSE)

Arguments

Value

A list with n_obs, detected_freq, n_cycles, trend_strength, seasonal_strength, ndiffs_needed, nsdiffs_needed, missing_ratio, arima_p, arima_q, arima_P, arima_Q.

Examples

df <- tibble::tibble(ds = as.Date("2024-01-01") + 0:29, y = 1:30 + rnorm(30))
analyze_series(df, date_agg = "day")

Description

Builds up to k_requested chronological, non-overlapping walk-forward folds from one ds-ordered series. Each fold's test window is exactly horizon_periods rows long. Degrades gracefully: if the series can't support k_requested folds, fewer are returned instead of erroring – possibly zero, for a very short series.

Usage

build_cv_folds(
  df,
  horizon_periods,
  k_requested,
  min_train = 2,
  window = c("expanding", "rolling"),
  train_window = NULL
)

Arguments

Value

A list of folds, oldest-first (fold 1 has the smallest training window under "expanding", or the same fixed width under "rolling"), each a list with train and test data frames.

Examples

df <- data.frame(ds = as.Date("2024-01-01") + 0:29, y = 1:30)
folds <- build_cv_folds(df, horizon_periods = 5, k_requested = 3)
length(folds)
rolling_folds <- build_cv_folds(df, horizon_periods = 5, k_requested = 3,
                                 window = "rolling", train_window = 10)
length(rolling_folds)

Description

Snaps each row's ds to the start of its period (per date_agg) and combines rows that land on the same period (and, if group_col is supplied, the same group) – e.g. case data split by district/sex/age with many rows per Year+Quarter.

Usage

collapse_to_period(
  df,
  date_agg = "day",
  fun = c("sum", "mean", "median", "none"),
  group_col = NULL
)

Arguments

Value

A tibble with one row per period (and group, if group_col is supplied), columns ds/y(/group_col).

Examples

df <- data.frame(ds = as.Date(c("2024-01-01", "2024-01-02")), y = c(3, 5))
collapse_to_period(df, date_agg = "month")

Description

Real-world tables often split the period across columns (a Year column plus a Quarter or Month column, sometimes plus a Day column) rather than carrying one parseable date. This assembles those into a single Date and reports the finest granularity present, so the caller can aggregate at that level (Year+Quarter -> quarterly, Year+Month -> monthly, and so on) instead of guessing.

Usage

compose_date_parts(
  df,
  year_col,
  quarter_col = NULL,
  month_col = NULL,
  day_col = NULL
)

Arguments

Value

A list with ds (a Date vector) and granularity (one of "year", "quarter", "month", "day", the finest part supplied).

Examples

df <- data.frame(Year = c(2023, 2023, 2024), Month = c("Jan", "Feb", "Jan"))
compose_date_parts(df, year_col = "Year", month_col = "Month")

Description

MASE/sMAPE/RMSE are all magnitude-only, so a model that's consistently over- or under-forecasting can still look "fine" on those alone. This surfaces the signed error directly. Generic across every registered model – only needs fc_tib's ds/yhat and test_df's ds/y.

Usage

compute_forecast_bias(fc_tib, test_df)

Arguments

Value

A list with bias (mean signed error, y - yhat), pct_bias (bias as a percentage of mean ⁠|y|⁠), and n. All NA/0 if there's no overlap.

Examples

ds <- as.Date("2024-01-01") + 0:4
fc_tib <- tibble::tibble(ds = ds, yhat = rep(8, 5))
test_df <- tibble::tibble(ds = ds, y = rep(10, 5))
compute_forecast_bias(fc_tib, test_df)

Description

Compute MASE, sMAPE, and RMSE for a forecast

Usage

compute_forecast_metrics(actual_df, forecast_df, label = "Test")

Arguments

Value

A tibble with columns Set, Metric ("MASE", "sMAPE (%)", "RMSE"), and Value – NA for all three if fewer than 2 rows overlap.

Examples

ds <- as.Date("2024-01-01") + 0:9
actual_df <- tibble::tibble(ds = ds, y = 1:10)
forecast_df <- tibble::tibble(ds = ds, yhat = 1:10 + 0.5)
compute_forecast_metrics(actual_df, forecast_df, label = "Test")

Description

Real-world grouping columns are often messy: "female"/"Female"/ "FEMALE" in the same column, meant to be one group, not three. Builds a raw-value -> canonical-label mapping (one row per distinct raw value) that the Import tab's "Merge / relabel values" table starts from and the user can further edit by hand.

Usage

compute_group_value_map(raw_values, merge_case = TRUE)

Arguments

Value

A tibble with columns raw (every distinct input value) and label (its canonical label).

Examples

compute_group_value_map(c("female", "Female", "male"))

Description

Whether a model's uncertainty bounds are honest, not just its point forecast: what fraction of actuals actually fell inside yhat_lower/yhat_upper, versus the interval's nominal confidence level (Prophet and the forecast-package adapters default to an 80% interval).

Usage

compute_interval_coverage(fc_tib, test_df, nominal_level = 0.8)

Arguments

Value

A list with empirical_coverage, nominal_level, gap (empirical_coverage - nominal_level), and n.

Examples

ds <- as.Date("2024-01-01") + 0:9
fc_tib <- tibble::tibble(ds = ds, yhat = 10, yhat_lower = 9, yhat_upper = 11)
test_df <- tibble::tibble(ds = ds, y = c(rep(10, 8), 20, 20))
compute_interval_coverage(fc_tib, test_df)

Description

A single aggregate score hides where a model actually fails – it can look strong on the full training range while drifting badly over the most recent months. Scores Train / Last 6 Months / Last 2 Years / Test (held out) using safe_compute_metrics(), skipping windows the series is too short to contain rather than reporting them as NA.

Usage

compute_multi_window_metrics(forecast_df, train_df, test_df, date_agg = "day")

Arguments

Value

A tibble with columns Set, Metric, Value – one block per window that applied.

Examples

ds <- as.Date("2024-01-01") + 0:29
train_df <- tibble::tibble(ds = ds[1:20], y = 1:20)
test_df <- tibble::tibble(ds = ds[21:30], y = 21:30)
forecast_df <- tibble::tibble(ds = ds, yhat = 1:30 + 0.5)
compute_multi_window_metrics(forecast_df, train_df, test_df)

Description

Whether a fitted model's error looks like unpredictable noise, or still has structure left in it: a Ljung-Box test for residual autocorrelation, a Shapiro-Wilk normality test, and the residual ACF with its Box-Jenkins confidence band. Generic across every registered model – only needs fc_tib's ds/yhat and test_df's ds/y.

Usage

compute_residual_diagnostics(fc_tib, test_df)

Arguments

Value

A list with residuals (tibble of ds/resid), ljung_box_p, shapiro_p (each NA if there isn't enough overlapping data), acf_df (tibble of lag/acf), ci (the confidence bound), and n.

Examples

ds <- as.Date("2024-01-01") + 0:29
fc_tib <- tibble::tibble(ds = ds, yhat = 100)
test_df <- tibble::tibble(ds = ds, y = 100 + rnorm(30))
compute_residual_diagnostics(fc_tib, test_df)

Description

Convert a forecast horizon in months to periods

Usage

convert_months_to_horizon(months, aggregation)

Arguments

Value

A numeric horizon in the same units as aggregation (e.g. days, for aggregation = "day"), suitable for a model's forecast(model, h) call.

Examples

convert_months_to_horizon(12, "day")
convert_months_to_horizon(12, "month")

Description

Used to tell the user what collapse_to_period() would do, before doing it. With group_col supplied, rows only count as duplicates if they share both a period and a group – two different districts on the same date are not a collision.

Usage

count_duplicate_periods(df, date_agg = "day", group_col = NULL)

Arguments

Value

A single integer: how many rows would be removed by collapsing (0 if none).

Examples

df <- data.frame(ds = as.Date(c("2024-01-01", "2024-01-02")), y = c(3, 5))
count_duplicate_periods(df, date_agg = "month")

Description

Surfaces the STL trend/seasonal/remainder split that analyze_series() already computes internally to drive the recommendation heuristic, as a tidy tibble a caller can plot directly.

Usage

decompose_series(df, date_agg = "day", robust = FALSE)

Arguments

Value

A tibble with columns ds, observed, trend, seasonal, remainder, or NULL (not an error) when no candidate frequency has enough cycles of data, or date_agg has no seasonal candidates at all (e.g. "year").

Examples

n <- 60
df <- tibble::tibble(ds = as.Date("2024-01-01") + 0:(n - 1),
                      y = 100 + 10 * sin(2 * pi * seq_len(n) / 7) + rnorm(n))
decompose_series(df, date_agg = "day")

Description

A statistical check on the values themselves – distinct from the Holidays tab's consistency check (calendar-vs-declared-holiday mismatch). Uses the STL remainder when decompose_series() finds one (isolates unusual points from normal trend/seasonal movement, which a raw-value check can't); falls back to deviation from a running median when no seasonal decomposition applies (short series, yearly aggregation, etc.), so it still works on every series shape.

Usage

detect_anomalies(
  df,
  date_agg = "day",
  method = c("iqr", "zscore"),
  threshold = 1.5
)

Arguments

Value

A tibble with columns ds, y, score (the value the threshold was applied to), and is_anomaly (logical).

Examples

df <- tibble::tibble(ds = as.Date("2024-01-01") + 0:29, y = c(rep(10, 29), 100))
detect_anomalies(df, date_agg = "day", method = "iqr")

Description

Splits the test window into n_splits sequential, roughly-equal chunks (oldest first) and computes compute_forecast_bias() in each – a simple, explainable drift signal (is ⁠|bias|⁠ growing chunk over chunk), not a full statistical trend test.

Usage

detect_bias_drift(fc_tib, test_df, n_splits = 2)

Arguments

Value

A list with chunks (a tibble of chunk/bias/pct_bias/n, one row per chunk) and drifting (TRUE if ⁠|bias|⁠ strictly increases chunk over chunk, FALSE if not, NA if there isn't enough data for a read).

Examples

ds <- as.Date("2024-01-01") + 0:9
fc_tib <- tibble::tibble(ds = ds, yhat = c(rep(10, 5), rep(6, 5)))
test_df <- tibble::tibble(ds = ds, y = rep(10, 10))
detect_bias_drift(fc_tib, test_df, n_splits = 2)

Description

Averages (simple or inverse-error-weighted) several already-fit models' forecasts – no re-fitting. Models that don't share every ds are handled by renormalizing weights per-row over whichever models actually have a value there.

Usage

ensemble_forecasts(
  forecasts,
  method = c("mean", "inverse_error"),
  errors = NULL
)

Arguments

Value

A tibble with columns ds and yhat – the combined forecast.

Examples

ds <- as.Date("2024-01-01") + 0:2
forecasts <- list(
  A = tibble::tibble(ds = ds, yhat = c(10, 10, 10)),
  B = tibble::tibble(ds = ds, yhat = c(20, 20, 20))
)
ensemble_forecasts(forecasts, method = "mean")
ensemble_forecasts(forecasts, method = "inverse_error", errors = list(A = 1, B = 5))

Description

The Holidays tab's checklist of recurring, fixed-date holidays. Matches the hosted Forecast Dashboard app's catalog exactly.

Usage

fixed_holiday_catalog()

Value

A named character vector: names are "MM-DD" dates, values are the holiday label.

Examples

fixed_holiday_catalog()

Description

Look up a registered model

Usage

get_model(key)

Arguments

Value

The registered model's list (key, label, fit, forecast, to_tibble, supports_holidays, requires, annotate).

Examples

model <- get_model("arima")
model$label

Description

Turns a link-shared Google Sheets URL (or a bare spreadsheet ID) into its CSV export endpoint, which works for any sheet shared as "Anyone with the link can view" – no OAuth, no credential storage.

Usage

googlesheet_csv_url(url, gid = NULL)

Arguments

Value

A character scalar, the CSV export URL.

Examples

googlesheet_csv_url("https://docs.google.com/spreadsheets/d/abc123/edit#gid=456")

Description

Correlation between every pair of configured groups' series, aligned on ds (pairwise-complete, so groups that don't share every period still compare on their overlap).

Usage

group_correlation_matrix(grouped_series_list)

Arguments

Value

A tibble with columns group_a, group_b, correlation – upper triangle only, no self-pairs, one row per distinct pair. Empty if fewer than 2 groups are supplied.

Examples

ds <- as.Date("2024-01-01") + 0:9
groups <- list(
  A = tibble::tibble(ds = ds, y = 1:10),
  B = tibble::tibble(ds = ds, y = 10:1)
)
group_correlation_matrix(groups)

Description

Bundles holidays_with_data() and always_zero_dates() – the app's full "consistency check."

Usage

holiday_contingency(holidays, data)

Arguments

Value

A list with with_data (see holidays_with_data()) and always_zero (see always_zero_dates()).

Examples

holidays <- tibble::tibble(ds = as.Date("2024-01-01"), holiday = "New Year")
data <- tibble::tibble(ds = as.Date("2024-01-01"), y = 5)
holiday_contingency(holidays, data)

Description

Shown in the UI whenever the selected model's supports_holidays is FALSE, mirroring the wording/style already used in the hosted app's ARIMA tab.

Usage

holiday_limitation_note(model_label)

Arguments

Value

A one-line character string.

Examples

holiday_limitation_note("ARIMA")

Description

Days declared as holidays that nonetheless carry non-zero values – usually means the holiday wasn't actually observed at that site, or data entry continued anyway.

Usage

holidays_with_data(holidays, data)

Arguments

Value

A tibble with columns ds, holiday, y, sorted by y descending; empty if holidays/data are NULL/empty.

Examples

holidays <- tibble::tibble(ds = as.Date("2024-01-01"), holiday = "New Year")
data <- tibble::tibble(ds = as.Date("2024-01-01"), y = 5)
holidays_with_data(holidays, data)

Description

Runs detect_anomalies(), replaces flagged points with NA, and re-interpolates with the same fill idiom used throughout this package (zoo::na.approx(), remaining edge NAs filled with the series mean) – a cleaned series to fit on instead of the raw one, so a handful of spikes/dips don't distort the fitted model the way they would untouched. Distinct from decompose_series()'s robust argument, which downweights outliers during decomposition rather than removing them before fitting; the two can be used independently or together.

Usage

impute_anomalies(
  df,
  date_agg = "day",
  method = c("iqr", "zscore"),
  threshold = 1.5
)

Arguments

Value

A tibble with columns ds, y (the cleaned series). The count of points that were flagged and replaced is attached as attr(result, "n_imputed").

Examples

df <- tibble::tibble(ds = as.Date("2024-01-01") + 0:29, y = c(rep(10, 29), 100))
impute_anomalies(df, date_agg = "day", method = "iqr")

Description

List every registered model

Usage

list_models(available_only = TRUE)

Arguments

Value

A list of registered model entries (see get_model() for the shape of each one).

Examples

vapply(list_models(available_only = TRUE), function(m) m$key, character(1))

Description

The "lstm" model requires the optional torch package. This checks whether it's installed, without loading it.

Usage

lstm_available()

Value

TRUE if torch is installed, FALSE otherwise.

Examples

lstm_available()

Description

Model-agnostic plotly plotting: works off just ds/yhat(+intervals) for models that only produce that, and additionally draws Prophet's trend/holiday/changepoint decomposition when forecast_df still has those columns (pass the adapter's raw forecast() output for that; pass the standardized to_tibble() output to metrics functions instead).

Usage

plot_forecast_generic(
  forecast_df,
  train_df = NULL,
  model_obj = NULL,
  subtitle = NULL,
  title = "Forecast",
  show_trend = TRUE,
  show_uncertainty = TRUE,
  show_holidays = FALSE,
  show_changepoints = FALSE,
  max_marker_lines = 60,
  color_actual = "#1b9e77",
  color_forecast = "#d95f02",
  color_trend = "#7570b3",
  color_ci = "#1b9e77"
)

Arguments

Value

A plotly htmlwidget.

Examples

ds <- as.Date("2024-01-01") + 0:9
forecast_df <- tibble::tibble(ds = ds, yhat = 1:10)
plot_forecast_generic(forecast_df)

Description

Used for the "Compare Selected Models" flow (and forecast ensembling, which adds one more named entry).

Usage

plot_model_comparison(forecasts, train_df = NULL, title = "Model Comparison")

Arguments

Value

A plotly htmlwidget.

Examples

ds <- as.Date("2024-01-01") + 0:9
forecasts <- list(
  ARIMA = tibble::tibble(ds = ds, yhat = 1:10),
  ETS = tibble::tibble(ds = ds, yhat = 1:10 + 1)
)
plot_model_comparison(forecasts)

Description

The Import tab's core transform: renames the user's chosen date/value columns to ds/y, aggregates individual-observation data into periods, and optionally normalizes by a population table to produce incidence rather than absolute counts.

Usage

process_uploaded_data(
  data,
  type = c("agg", "individual"),
  date_col,
  value_col = NULL,
  group_col = NULL,
  pop_df = NULL,
  pop_date_col = NULL,
  pop_value_col = NULL,
  pop_group_col = NULL,
  unit_divisor = 1,
  pop_multiplier = 1,
  date_agg = "day",
  pop_freq = "year"
)

Arguments

Value

A tibble with columns ds, y, and group_col if supplied.

Examples

df <- data.frame(when = as.Date("2024-01-01") + 0:9, count = 1:10)
process_uploaded_data(df, type = "agg", date_col = "when", value_col = "count")

Description

The "prophet" model requires the optional prophet package. This checks whether it's installed, without loading it.

Usage

prophet_available()

Value

TRUE if prophet is installed, FALSE otherwise.

Examples

prophet_available()

Description

Requires the sheet be shared as "Anyone with the link can view." Makes a real network request via googlesheet_csv_url() – not runnable on CRAN's offline check machines.

Usage

read_google_sheet(url, gid = NULL)

Arguments

Value

A data frame, as read by utils::read.csv().

Examples

## Not run: 
read_google_sheet("https://docs.google.com/spreadsheets/d/abc123/edit")

## End(Not run)

Description

Scores every candidate model against analyze_series()'s measured trend/seasonality/regularity, with short human-readable reasons – no model is actually fit, so this is fast enough to run right after a dataset is finalized.

Usage

recommend_model(analysis, holidays_configured = FALSE, candidates = NULL)

Arguments

Value

A data frame with columns model (label), key, score, and reason, sorted by score descending.

Examples

df <- tibble::tibble(ds = as.Date("2024-01-01") + 0:59, y = 1:60 + rnorm(60))
recommend_model(analyze_series(df, "day"))

Description

Sums already-fit per-group forecasts (and their actuals) instead of fitting the aggregate separately – the sum of individually-coherent group forecasts is itself always coherent by construction. Point forecasts sum exactly; prediction intervals are summed too, under the standard (if approximate) bottom-up assumption that group forecast errors are perfectly correlated – flagged as a known simplification, not a bug.

Usage

reconcile_bottom_up(fits)

Arguments

Value

A list with fc_tib, train, test (each summed by ds across groups, or NULL if no group supplied that field), and components (the names of the groups that were actually combined).

Examples

ds <- as.Date("2024-01-01") + 0:2
fits <- list(
  A = list(fc_tib = tibble::tibble(ds = ds, yhat = c(10, 11, 12)),
           train = tibble::tibble(ds = ds, y = c(9, 10, 11))),
  B = list(fc_tib = tibble::tibble(ds = ds, yhat = c(1, 2, 3)),
           train = tibble::tibble(ds = ds, y = c(1, 1, 1)))
)
reconcile_bottom_up(fits)

Description

Disaggregates one already-fit aggregate-level forecast down to each group by that group's fixed historical share of the total, instead of fitting (or summing) each group's own forecast shape the way reconcile_bottom_up() does. Coherent by construction (the shares sum to 1), and a meaningfully different result from bottom-up whenever the aggregate-level model captures dynamics the per-group models miss (or vice versa) – not just the same total recomputed a different way.

Usage

reconcile_top_down(fits, aggregate_forecast)

Arguments

Value

A list with fc_tib (aggregate_forecast's own columns, unchanged – the top-down total is the aggregate-level forecast), train/test (NULL; the caller already has the aggregate-level train/test that produced aggregate_forecast and should use those directly for display), components (the names of the groups whose historical shares were used), and proportions (a named list, one fixed share per group, summing to 1).

Examples

ds <- as.Date("2024-01-01") + 0:2
fits <- list(
  A = list(train = tibble::tibble(ds = ds, y = c(9, 10, 11))),
  B = list(train = tibble::tibble(ds = ds, y = c(1, 1, 1)))
)
aggregate_forecast <- tibble::tibble(ds = ds, yhat = c(10, 11, 12))
reconcile_top_down(fits, aggregate_forecast)

Description

Adds a model to the package's pluggable registry, keyed by key. Every model implements the same three-function contract (fit/forecast/ to_tibble), so once registered it works everywhere in the bundled app (Model tab, Compare Selected Models, Cross-Validation, the Backtest Leaderboard, the Show Code panel) with no other code changes.

Usage

register_model(
  key,
  label,
  fit,
  forecast,
  to_tibble,
  supports_holidays = FALSE,
  requires = NULL,
  annotate = NULL
)

Arguments

Value

TRUE, invisibly.

Examples

register_model(
  key = "naive_last",
  label = "Naive (last value)",
  fit = function(train_df, date_agg = "day", ...) utils::tail(train_df$y, 1),
  forecast = function(model_obj, h, ...) list(mean = rep(model_obj, h)),
  to_tibble = function(fc_obj, test_df) {
    tibble::tibble(ds = test_df$ds[seq_along(fc_obj$mean)], yhat = fc_obj$mean)
  }
)

Description

Unlike the hosted Forecast Dashboard app, this exposes every registered, available model (Prophet, ARIMA, SARIMA, ETS, TBATS, NNETAR, Holt-Winters, and LSTM if torch is installed) with Plotly always on and no memory-conserving toggles, since it targets local/offline use rather than a free hosting tier.

Usage

run_app(...)

Arguments

Details

The Data Import tab's "Global environment" source only reads data frames; it never writes. By default it lists them from the global environment. Set ⁠options(forecastsuite.data_env = <environment>)⁠ to point it at a different environment instead.

Value

A shiny.appobj, as returned by shiny::shinyApp(). Printing it (e.g. calling run_app() at the console, or letting it auto-print) launches the app; it does not block on its own.

Examples

if (interactive()) {
  run_app()
}

Description

Runs build_cv_folds() once and refits every model in model_keys across every fold, ranking them by mean test MASE – a real multi-model extension of single-model cross-validation. A fold a model fails on is dropped for that model rather than failing the whole row; a model with zero successful folds (including an invalid model_keys entry) gets an NA row instead of being dropped, so it's still visible in the result as "failed."

Usage

run_backtest_leaderboard(
  model_keys,
  df,
  date_agg,
  horizon_periods,
  k_requested,
  build_args = function(model_key, train_df) {
     list(train_df = train_df, date_agg =
    date_agg)
 },
  window = c("expanding", "rolling"),
  train_window = NULL
)

Arguments

Value

A tibble with one row per model in model_keys, columns model (label), key, n_folds, mean_mase, sd_mase, mean_smape, mean_rmse, ranked ascending by mean_mase (NA last).

Examples

df <- data.frame(ds = as.Date("2024-01-01") + 0:59,
                  y = 100 + seq_len(60) * 0.2 + stats::rnorm(60, sd = 2))

run_backtest_leaderboard(c("arima", "ets"), df, date_agg = "day",
                          horizon_periods = 5, k_requested = 2)

Description

Same as compute_forecast_metrics(), but checks actual_df's row count first so callers don't need their own length guard before calling it.

Usage

safe_compute_metrics(forecast_df, actual_df, label)

Arguments

Value

A tibble with columns Set, Metric, Value (see compute_forecast_metrics()).

Examples

ds <- as.Date("2024-01-01") + 0:9
forecast_df <- tibble::tibble(ds = ds, yhat = 1:10 + 0.5)
actual_df <- tibble::tibble(ds = ds, y = 1:10)
safe_compute_metrics(forecast_df, actual_df, label = "Test")

Description

Split a ds/y/group tibble into one tibble per group

Usage

split_by_group(df, group_col)

Arguments

Value

A named list of ds/y tibbles, one per distinct value of group_col (names sorted), or NULL if group_col is NULL or not present in df.

Examples

df <- data.frame(ds = as.Date("2024-01-01") + 0:3,
                  y = 1:4, District = c("A", "A", "B", "B"))
split_by_group(df, "District")

Description

Derives starting-point hyperparameters from analyze_series()'s diagnostics rather than fitting a grid of candidates. These are informed starting points, not optimal values – for ARIMA/SARIMA, auto.arima() still searches the order space better than this heuristic; the suggested p/q matter mainly for hand-tuning, while d/D come straight from ndiffs()/nsdiffs().

Usage

suggest_parameters(analysis, model_key)

Arguments

Value

A list with params (a named list of suggested argument values, matching that model's fit() parameters), text (a one-line human-readable summary), and reasons (a character vector explaining each suggestion).

Examples

df <- tibble::tibble(ds = as.Date("2024-01-01") + 0:59, y = 1:60 + rnorm(60))
suggest_parameters(analyze_series(df, "day"), "arima")

Description

Vectorized suggest_parameters(), for the recommendation table's "suggested settings" column.

Usage

suggest_parameters_for(analysis, model_keys)

Arguments

Value

A character vector, the same length as model_keys, of each model's suggestion text.

Examples

df <- tibble::tibble(ds = as.Date("2024-01-01") + 0:59, y = 1:60 + rnorm(60))
suggest_parameters_for(analyze_series(df, "day"), c("arima", "prophet"))

Description

Map an aggregation frequency to a ts() seasonal frequency

Usage

ts_frequency_for(date_agg)

Arguments

Value

A single integer, suitable for stats::ts(y, frequency = ...).

Examples

ts_frequency_for("month")