Frequencies for first 10,000 rows of comstat5 variable in namcs2011 dataset :

   Medication #5 - |
Composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      2,063       20.63       20.63
  Combination drug |        196        1.96       22.59
      Undetermined |         46        0.46       23.05
                 . |      7,695       76.95      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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