Frequencies for first 10,000 rows of comstat11 variable in nhamcsed2012 dataset :

Composition status |
          code for |
    medication #11 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         38        0.38        0.38
  Combination drug |          5        0.05        0.43
                 . |      9,957       99.57      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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