Frequencies for first 10,000 rows of comstat1 variable in namcs2014 dataset :

Composition status |
          code for |
     medication #1 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      6,259       62.59       62.59
  Combination drug |      1,044       10.44       73.03
      Undetermined |        189        1.89       74.92
                 . |      2,508       25.08      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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