Frequencies for first 10,000 rows of comstat25 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #25 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         15        0.15        0.15
  Combination drug |          4        0.04        0.19
      Undetermined |          1        0.01        0.20
                 . |      9,980       99.80      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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