Frequencies for first 10,000 rows of comstat11 variable in nhamcsed2013 dataset :

Composition status |
          code for |
    medication #11 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         76        0.76        0.76
  Combination drug |          7        0.07        0.83
                 . |      9,917       99.17      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016