Frequencies for first 10,000 rows of electrol variable in namcs2006 dataset :

electrolyte |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,360       93.60       93.60
        yes |        640        6.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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