Frequencies for first 10,000 rows of comstat20 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #20 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         69        0.69        0.69
  Combination drug |          5        0.05        0.74
      Undetermined |          1        0.01        0.75
                 . |      9,925       99.25      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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