Frequencies for first 10,000 rows of contsub5 variable in namcs1995 dataset :

 controlled |
  substance |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          6        0.06        0.06
          3 |          2        0.02        0.08
          4 |         36        0.36        0.44
          5 |          3        0.03        0.47
          6 |        647        6.47        6.94
          7 |         12        0.12        7.06
          . |      9,294       92.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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