Frequencies for first 10,000 rows of electrol variable in namcs2008 dataset :

electrolyte |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,393       93.93       93.93
        yes |        607        6.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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