Frequencies for first 10,000 rows of rf_eclam variable in natlterr2010 dataset :

  Eclampsia |
        RFP |
586=rf_ecla |
       mp R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,656       46.56       46.56
          N |      4,568       45.68       92.24
          U |        767        7.67       99.91
          Y |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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