Frequencies for first 10,000 rows of comstat3 variable in nhamcsed2006 dataset :

          for rx3, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |      2,047       20.47       20.47
  combination drug |        409        4.09       24.56
                 . |      7,544       75.44      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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