Frequencies for first 10,000 rows of comstat8 variable in nhamcsed2015 dataset 

Composition status |
          code for |
     medication #8 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |        403        4.03        4.03
  Combination drug |         43        0.43        4.46
      Undetermined |          3        0.03        4.49
                 . |      9,551       95.51      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017