Frequencies for first 10,000 rows of comstat11 variable in nhamcsed2014 dataset :

Composition status |
          code for |
    medication #11 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        139        1.39        1.39
  Combination drug |          9        0.09        1.48
      Undetermined |          1        0.01        1.49
                 . |      9,851       98.51      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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