Frequencies for first 10,000 rows of comstat8 variable in nhamcsopd2007 dataset :

          for rx8, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        776        7.76        7.76
  combination drug |         68        0.68        8.44
                 . |      9,156       91.56      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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