Frequencies for first 10,000 rows of comstat8 variable in namcs2012 dataset :

Composition status |
          code for |
      medication 8 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        822        8.22        8.22
  Combination drug |         63        0.63        8.85
      Undetermined |         20        0.20        9.05
                 . |      9,095       90.95      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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