Frequencies for first 10,000 rows of comstat13 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #13 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        420        4.20        4.20
  Combination drug |         27        0.27        4.47
      Undetermined |         14        0.14        4.61
                 . |      9,539       95.39      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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