Frequencies for first 10,000 rows of contsub12 variable in namcs2014 dataset : Controlled substance code | for medication #12 | Freq. Percent Cum. ---------------------------+----------------------------------- Schedule II | 5 0.05 0.05 Schedule III | 7 0.07 0.12 Schedule IV | 26 0.26 0.38 Schedule V | 2 0.02 0.40 No control | 558 5.58 5.98 Undetermined | 12 0.12 6.10 Multiple schedules | 1 0.01 6.11 . | 9,389 93.89 100.00 ---------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 27 Mar 2017