Frequencies for first 10,000 rows of comstat7 variable in nhamcsed2015 dataset 

Composition status |
          code for |
     medication #7 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        564        5.64        5.64
  Combination drug |         77        0.77        6.41
      Undetermined |          6        0.06        6.47
                 . |      9,353       93.53      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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