Used in the following functions:
arv, bp_mag, bp_range, cv, sv, bp_center, bp_stats
create_grps(data, inc_date, add_groups)Supplied data from function
TRUE/FALSE indicator from function argument for whether or not to include the date in grouping
Character vector from function argument input corresponding to which other variables other than "ID", "WAKE", and "VISIT" to include from the supplied data's column names. If "DATE" is supplied in add_groups, and inc_date = TRUE, the duplicate will be omitted.
A vector of string values corresponding to the column names that will subset / group the data in dplyr functions