Frequencies for first 10,000 rows of f_urf_eclamp variable in natl2013 dataset :

  Eclampsia |
(urf_eclam) |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.03        0.03
          1 |      9,997       99.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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