Frequencies for first 10,000 rows of comstat7 variable in namcs2012 dataset :

Composition status |
          code for |
      medication 7 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      1,029       10.29       10.29
  Combination drug |         83        0.83       11.12
      Undetermined |         20        0.20       11.32
                 . |      8,868       88.68      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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