Frequencies for first 10,000 rows of comstat5 variable in namcs2014 dataset :

Composition status |
          code for |
     medication #5 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      2,520       25.20       25.20
  Combination drug |        221        2.21       27.41
      Undetermined |         51        0.51       27.92
                 . |      7,208       72.08      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017