Frequencies for first 10,000 rows of urf_eclam variable in natlterr2005 dataset :

  Eclampsia |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         16        0.16        0.16
          2 |      8,197       81.97       82.13
          9 |      1,787       17.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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