Frequencies for first 10,000 rows of rf_ehype variable in natlterr2015 dataset :

Hypertensio |
n Eclampsia |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,078       10.78       10.78
          N |      8,857       88.57       99.35
          U |         57        0.57       99.92
          Y |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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