Frequencies for first 10,000 rows of comstat5 variable in nhamcsed2007 dataset :

          for rx5, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        735        7.35        7.35
  combination drug |        122        1.22        8.57
                 . |      9,143       91.43      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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