Frequencies for first 10,000 rows of comstat8 variable in nhamcsed2006 dataset :

          for rx8, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |         43        0.43        0.43
  combination drug |          2        0.02        0.45
                 . |      9,955       99.55      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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