Frequencies for first 10,000 rows of comstat7 variable in namcs2008 dataset :

composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        987        9.87        9.87
  combination drug |        110        1.10       10.97
                 . |      8,903       89.03      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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