Add forced group levels

Expand the set of unique group levels of one grouping variables in a table containing all combinations of one or more grouping variables.

Usage

add_forced_group_levels(combos_all, forced_group_levels)

Arguments

combos_all

A data.table containing all combinations of group levels found in the analysis data.

forced_group_levels

A one column data.table containing a required set of group levels of a grouping variable.

Value

A data.table containing all combinations of group levels exapnded with the forced grouping levels.