Frequencies for first 10,000 rows of comstat7 variable in nhamcsed2014 dataset :

Composition status |
          code for |
     medication #7 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        452        4.52        4.52
  Combination drug |         67        0.67        5.19
      Undetermined |          4        0.04        5.23
                 . |      9,477       94.77      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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