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

Pre-pregnan |
         cy |
Hypertensio |
    n Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,739       87.39       98.16
          U |         76        0.76       98.92
          Y |        108        1.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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