Frequencies for first 10,000 rows of comstat2 variable in namcs2011 dataset :

   Medication #2 - |
Composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      4,765       47.65       47.65
  Combination drug |        735        7.35       55.00
      Undetermined |         90        0.90       55.90
                 . |      4,410       44.10      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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