Frequencies for first 10,000 rows of comstat10 variable in namcs2012 dataset :

Composition status |
          code for |
    medication #10 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        447        4.47        4.47
  Combination drug |         35        0.35        4.82
      Undetermined |         18        0.18        5.00
                 . |      9,500       95.00      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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