Frequencies for first 10,000 rows of comstat6 variable in nhamcsopd2003 dataset :

composition status |
          code for |
     medication #6 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        823        8.23        8.23
  combination drug |        104        1.04        9.27
      undetermined |         29        0.29        9.56
                 . |      9,044       90.44      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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