Frequencies for first 10,000 rows of contsub1 variable in namcs2002 dataset :

Controlled status code for |
             medication #1 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        128        1.28        1.28
              Schedule III |        128        1.28        2.56
               Schedule IV |        156        1.56        4.12
                Schedule V |         18        0.18        4.30
                No control |      5,430       54.30       58.60
              Undetermined |        237        2.37       60.97
                         . |      3,903       39.03      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016