Frequencies for first 10,000 rows of comstat13 variable in nhamcsed2014 dataset :

Composition status |
          code for |
    medication #13 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         84        0.84        0.84
  Combination drug |          7        0.07        0.91
      Undetermined |          1        0.01        0.92
                 . |      9,908       99.08      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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