Frequencies for first 10,000 rows of eclamp variable in natl1995 dataset :

  Eclampsia |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         29        0.29        0.29
          2 |      9,928       99.28       99.57
          9 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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