Frequencies for first 10,000 rows of comstat22 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #22 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         38        0.38        0.38
  Combination drug |          5        0.05        0.43
      Undetermined |          2        0.02        0.45
                 . |      9,955       99.55      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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