In the Actual PERCH data set, a study site may have multiple subsites.
clean_combine_subsites combines all the study subjects from the same site.
clean_combine_subsites(raw_meas_dir, subsites_list, newsites_vec)A data frame with combined sites
The file path to the raw data file (.csv)
The list of subsite group names. Each group is a vector of subsites to be combined
A vector of new site names. It has the same length as
"subsites_list"