Frequencies for first 10,000 rows of comstat5 variable in nhamcsed2014 dataset :

Composition status |
code medication #5 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      1,128       11.28       11.28
  Combination drug |        168        1.68       12.96
      Undetermined |         17        0.17       13.13
                 . |      8,687       86.87      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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