Frequencies for first 10,000 rows of comstat3 variable in nhamcsed2015 dataset 

Composition status |
          code for |
     medication #3 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      3,303       33.03       33.03
  Combination drug |        452        4.52       37.55
      Undetermined |         50        0.50       38.05
                 . |      6,195       61.95      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017