Frequencies for first 10,000 rows of comstat6 variable in namcs2014 dataset :

Composition status |
          code for |
     medication #6 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      2,021       20.21       20.21
  Combination drug |        168        1.68       21.89
      Undetermined |         57        0.57       22.46
                 . |      7,754       77.54      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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