Frequencies for first 10,000 rows of comstat12 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #12 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        552        5.52        5.52
  Combination drug |         47        0.47        5.99
      Undetermined |         12        0.12        6.11
                 . |      9,389       93.89      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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