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

  Pregnancy |
 Associated |
Hypertensio |
    n 1 Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        235        2.35        2.35
          2 |      8,630       86.30       88.65
          9 |      1,135       11.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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