Frequencies for first 10,000 rows of comstat10 variable in nhamcsed2012 dataset :

Composition status |
          code for |
    medication #10 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        115        1.15        1.15
  Combination drug |          9        0.09        1.24
      Undetermined |          2        0.02        1.26
                 . |      9,874       98.74      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016