Frequencies for first 10,000 rows of comstat6 variable in namcs2011 dataset :

   Medication #6 - |
Composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      1,589       15.89       15.89
  Combination drug |        135        1.35       17.24
      Undetermined |         27        0.27       17.51
                 . |      8,249       82.49      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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