Frequencies for first 10,000 rows of comstat8 variable in nhamcsed2014 dataset :

Composition status |
          code for |
     medication #8 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        332        3.32        3.32
  Combination drug |         35        0.35        3.67
      Undetermined |          3        0.03        3.70
                 . |      9,630       96.30      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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