Frequencies for first 10,000 rows of comstat15 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #15 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        247        2.47        2.47
  Combination drug |         18        0.18        2.65
      Undetermined |          6        0.06        2.71
                 . |      9,729       97.29      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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