This function differentiates the type of measurement variables.
util_dist_selection(measurements, meta_data)study data
meta data, not yet used
data frame with one column for each variable in study data giving
IsInteger, IsMultCat and IsNCategory
IsInteger contains a guess, if the variable contains integer values or is a
factor
IsMultCat contains a guess, if the variable has more than two categories,
if it is categorical or ordinal
NCategory contains the number of distinct values detected for the variable