Frequencies for first 10,000 rows of comstat21 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #21 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         57        0.57        0.57
  Combination drug |          3        0.03        0.60
      Undetermined |          6        0.06        0.66
                 . |      9,934       99.34      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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