Frequencies for first 10,000 rows of comstat10 variable in namcs2013 dataset :

Composition status |
          code for |
    medication #10 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        682        6.82        6.82
  Combination drug |         72        0.72        7.54
      Undetermined |         13        0.13        7.67
                 . |      9,233       92.33      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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