Frequencies for first 10,000 rows of comstat6 variable in namcs2012 dataset :

Composition status |
          code for |
      medication 6 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      1,306       13.06       13.06
  Combination drug |        112        1.12       14.18
      Undetermined |         29        0.29       14.47
                 . |      8,553       85.53      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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