Frequencies for first 10,000 rows of electrol variable in nhamcsopd2008 dataset :

electrolyte |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,541       95.41       95.41
        yes |        459        4.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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