Frequencies for first 10,000 rows of comstat16 variable in namcs2014 dataset :

Composition status |
          code for |
    medication #16 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        181        1.81        1.81
  Combination drug |         17        0.17        1.98
      Undetermined |          3        0.03        2.01
                 . |      9,799       97.99      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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