Frequencies for first 10,000 rows of comstat6 variable in namcs2002 dataset :

Composition status |
          code for |
     medication #6 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        555        5.55        5.55
  Combination drug |         57        0.57        6.12
      Undetermined |          9        0.09        6.21
                 . |      9,379       93.79      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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