Frequencies for first 10,000 rows of comstat8 variable in nhamcsopd2003 dataset :

composition status |
          code for |
     medication #8 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        469        4.69        4.69
  combination drug |         52        0.52        5.21
      undetermined |         19        0.19        5.40
                 . |      9,460       94.60      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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