Frequencies for first 10,000 rows of comstat9 variable in nhamcsed2015 dataset 

Composition status |
          code for |
     medication #9 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        302        3.02        3.02
  Combination drug |         26        0.26        3.28
      Undetermined |          2        0.02        3.30
                 . |      9,670       96.70      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017