Frequencies for first 10,000 rows of comstat7 variable in namcs2014 dataset :

Composition status |
          code for |
     medication #7 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      1,661       16.61       16.61
  Combination drug |        126        1.26       17.87
      Undetermined |         36        0.36       18.23
                 . |      8,177       81.77      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017