Iterate over omissions of a certain group in a dataset. One group is omitted at a time.
omit_data(dataset_or_model, group, name_pattern = "omitted_{}")(iterator) Iterator yielding tuples of models/dataframes and the omitted group
(data.frame or Model) Dataset or model for which to omit records
(str) Name of the column to use for grouping
(str) Name to use for generated datasets. A number starting from 1 will be put in the placeholder.