Frequencies for first 10,000 rows of comstat12 variable in nhamcsed2012 dataset :

Composition status |
          code for |
    medication #12 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |         14        0.14        0.14
                 . |      9,986       99.86      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016