Frequencies for first 10,000 rows of comstat8 variable in namcs2006 dataset :

          for rx8, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        568        5.68        5.68
  combination drug |         55        0.55        6.23
                 . |      9,377       93.77      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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