Frequencies for first 10,000 rows of eclamp variable in natl1997 dataset :

  Eclampsia |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         33        0.33        0.33
          2 |      9,958       99.58       99.91
          9 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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