Frequencies for first 10,000 rows of comstat19 variable in nhamcsed2014 dataset :

Composition status |
          code for |
    medication #19 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         24        0.24        0.24
  Combination drug |          3        0.03        0.27
                 . |      9,973       99.73      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017