Frequencies for first 10,000 rows of rf_ehype variable in natl2017 dataset :

Hypertensio |
n Eclampsia |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,739       97.39       97.39
          U |         90        0.90       98.29
          Y |        171        1.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018