Frequencies for first 10,000 rows of rf_eclam variable in natlterr2013 dataset :

  Eclampsia |
        RFP |
586=rf_ecla |
       mp R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,663       86.63       97.40
          U |        242        2.42       99.82
          Y |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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