Frequencies for first 10,000 rows of comstat17 variable in nhamcsed2014 dataset :

Composition status |
          code for |
    medication #17 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         34        0.34        0.34
  Combination drug |          1        0.01        0.35
      Undetermined |          1        0.01        0.36
                 . |      9,964       99.64      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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