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

  Eclampsia |
        RFP |
586=rf_ecla |
       mp R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,643       96.43       96.43
          U |        167        1.67       98.10
          Y |        190        1.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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