Frequencies for first 10,000 rows of comstat8 variable in nhamcsopd2006 dataset :

          for rx8, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        515        5.15        5.15
  Combination drug |         65        0.65        5.80
                 . |      9,420       94.20      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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