Frequencies for first 10,000 rows of comstat17 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #17 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        142        1.42        1.42
  Combination drug |         13        0.13        1.55
      Undetermined |          2        0.02        1.57
                 . |      9,843       98.43      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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