Frequencies for first 10,000 rows of rf_ehype variable in natl2015 dataset :

Hypertensio |
n Eclampsia |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,796       97.96       97.96
          U |        108        1.08       99.04
          Y |         96        0.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016