Frequencies for first 10,000 rows of comstat8 variable in nhamcsed2007 dataset :

          for rx8, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        127        1.27        1.27
  combination drug |         19        0.19        1.46
                 . |      9,854       98.54      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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