Frequencies for first 10,000 rows of contsub6 variable in namcs2002 dataset :

Controlled status code for |
             medication #6 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          9        0.09        0.09
              Schedule III |          6        0.06        0.15
               Schedule IV |         18        0.18        0.33
                No control |        578        5.78        6.11
              Undetermined |         10        0.10        6.21
                         . |      9,379       93.79      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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