Frequencies for first 10,000 rows of electrol variable in namcs2003 dataset :

electrolyte |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,719       97.19       97.19
          1 |        281        2.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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