Get data grouping
# S3 method for pk
get_data_group(obj, as_character = FALSE, ...)
An object of class `call` giving the data grouping as a `dplyr::vars()` specification
An initialized `pk` object.
Logical (Default: `FALSE`). Determines whether to return a character vector. If set to `FALSE`, a list of expressions containing the `data_group` variables is returned.
Additional arguments not currently in use.