Frequencies for first 10,000 rows of comstat7 variable in namcs2011 dataset :

   Medication #7 - |
Composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      1,190       11.90       11.90
  Combination drug |        108        1.08       12.98
      Undetermined |         21        0.21       13.19
                 . |      8,681       86.81      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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