Frequencies for first 10,000 rows of comstat3 variable in namcs2011 dataset :

   Medication #3 - |
Composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      3,548       35.48       35.48
  Combination drug |        478        4.78       40.26
      Undetermined |         56        0.56       40.82
                 . |      5,918       59.18      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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