Compute Governed Exact K-Fold Cross-Validation — compute_kfold

Uses brms::kfold() as an explicit fallback or complement to PSIS-LOO. Grouped folds may use only the declared participant or item grouping column. No model is selected automatically.

Usage

compute_kfold_cv(
  fit,
  K = 10L,
  folds = c("random", "stratified", "grouped"),
  group = NULL,
  joint = c("obs", "fold", "group"),
  save_fits = FALSE,
  seed = 1L
)

Arguments

fit: Approved gp3bayes fit.
K: Number of folds for random or stratified splitting.
folds: One of "random", "stratified", or "grouped".
group: Optional declared grouping column used by stratified/grouped splitting.
joint: One of "obs", "fold", or "group".
save_fits: Whether cross-validation refits are retained.
seed: Random seed.

Value

A gp3bayes_kfold_cv.