This is the S3 method generic for `fold_error`.
fold_error(obj, ...)A data.frame with one row for each `data_group`, `model` and `method`. A column contains the fold errors (observed/predicted) of the model fitted by the corresponding method. These residuals are concentrations in the same units as `obj$data$Conc.Units`; any concentration transformations (in `obj$scale$conc`) are *not* applied.
an object
Additional arguments currently not in use.
[fold_error.pk()] for the `fold_error` method for class [pk()]