Frequencies for first 10,000 rows of comstat8 variable in nhamcsed2003 dataset :

composition status |
          code for |
     medication #8 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        192        1.92        1.92
  combination drug |         26        0.26        2.18
      undetermined |          5        0.05        2.23
                 . |      9,777       97.77      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016