Frequencies for first 10,000 rows of rf_eclam variable in natlterr2007 dataset :

  Eclampsia |
        RFP |
586=rf_ecla |
       mp R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,163       61.63       61.63
          N |      3,830       38.30       99.93
          U |          1        0.01       99.94
          Y |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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