Frequencies for first 10,000 rows of comstat8 variable in nhamcsed2013 dataset :

Composition status |
          code for |
     medication #8 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        233        2.33        2.33
  Combination drug |         19        0.19        2.52
                 . |      9,748       97.48      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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