Frequencies for first 10,000 rows of comstat8 variable in nhamcsed2004 dataset :

composition status |
          code for |
     medication #8 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        299        2.99        2.99
  combination drug |         40        0.40        3.39
      undetermined |         12        0.12        3.51
                 . |      9,649       96.49      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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