Frequencies for first 10,000 rows of f_rf_eclamp variable in natl2009 dataset :

  Eclampsia |
 (rf_eclam) |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,944       99.44       99.44
          1 |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015