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This is the S3 method generic for get_data_sigma_group()
get_data_sigma_group(obj, ...)
A `factor` vector giving the error SD group ID for each observation, as the interaction of the factors specified in `obj$pk_groups$error_group`.
An object.
Additional arguments currently not in use.
[get_data_sigma_group.pk()] for the method for class [pk()]