Frequencies for first 10,000 rows of rf_ehype variable in natl2014 dataset :

Hypertensio |
n Eclampsia |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,727       97.27       97.27
          U |        128        1.28       98.55
          Y |        145        1.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016