Frequencies for first 10,000 rows of comstat12 variable in nhamcsed2013 dataset :

Composition status |
          code for |
    medication #12 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         54        0.54        0.54
  Combination drug |          4        0.04        0.58
                 . |      9,942       99.42      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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