Frequencies for first 10,000 rows of comstat4 variable in namcs2011 dataset :

   Medication #4 - |
Composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      2,712       27.12       27.12
  Combination drug |        286        2.86       29.98
      Undetermined |         39        0.39       30.37
                 . |      6,963       69.63      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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