Frequencies for first 10,000 rows of comstat5 variable in nhamcsed2015 dataset 

Composition status |
code medication #5 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      1,334       13.34       13.34
  Combination drug |        185        1.85       15.19
      Undetermined |         17        0.17       15.36
                 . |      8,464       84.64      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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