Frequencies for first 10,000 rows of comstat5 variable in namcs2002 dataset :

Composition status |
          code for |
     medication #5 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        749        7.49        7.49
  Combination drug |         68        0.68        8.17
      Undetermined |         22        0.22        8.39
                 . |      9,161       91.61      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016