Frequencies for first 10,000 rows of comstat7 variable in namcs2010 dataset :

composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |      1,014       10.14       10.14
  combination drug |        114        1.14       11.28
      undetermined |         11        0.11       11.39
                 . |      8,861       88.61      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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