Frequencies for first 10,000 rows of comstat6 variable in nhamcsed2014 dataset :

Composition status |
          code for |
     medication #6 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        687        6.87        6.87
  Combination drug |        111        1.11        7.98
      Undetermined |          8        0.08        8.06
                 . |      9,194       91.94      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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