Frequencies for first 10,000 rows of comstat8 variable in nhamcsopd2008 dataset :

          for rx8, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        842        8.42        8.42
  combination drug |         80        0.80        9.22
                 . |      9,078       90.78      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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