Frequencies for first 10,000 rows of comstat4 variable in namcs2014 dataset :

Composition status |
          code for |
     medication #4 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      3,115       31.15       31.15
  Combination drug |        306        3.06       34.21
      Undetermined |         83        0.83       35.04
                 . |      6,496       64.96      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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