Frequencies for first 10,000 rows of rf_ghype variable in natlterr2014 dataset 

Gestational |
Hypertensio |
    n Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,574       85.74       96.51
          U |         76        0.76       97.27
          Y |        273        2.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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