does the same as as.data.frame(table(x)) but
guarantees a data frame with two columns is returned
util_table_of_vct(Var1)a data frame with columns Var1 and Freq
vector to ta tabulate
Other data_management:
util_assign_levlabs(),
util_check_data_type(),
util_check_group_levels(),
util_compare_meta_with_study(),
util_dichotomize(),
util_merge_data_frame_list(),
util_rbind(),
util_remove_na_records(),
util_replace_hard_limit_violations(),
util_study_var2factor()