Frequencies for first 10,000 rows of comstat5 variable in nhamcsed2003 dataset :

composition status |
          code for |
     medication #5 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        731        7.31        7.31
  combination drug |        110        1.10        8.41
      undetermined |         43        0.43        8.84
                 . |      9,116       91.16      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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