Frequencies for first 10,000 rows of drugbenefittype variable in snp2008 dataset :

       Drug |
    Benefit |
       Type |      Freq.     Percent        Cum.
------------+-----------------------------------
      Basic |      3,631       36.31       36.31
   Enhanced |      6,369       63.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016