Frequencies for first 10,000 rows of comstat7 variable in namcs2006 dataset :

          for rx7, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        805        8.05        8.05
  combination drug |         85        0.85        8.90
                 . |      9,110       91.10      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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