Frequencies for first 10,000 rows of electrol variable in nhamcsed2007 dataset :

electrolyte |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,614       76.14       76.14
        yes |      2,386       23.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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