Frequencies for first 10,000 rows of f_rf_ppo variable in natlterr2006 dataset :

       Poor |
  Pregnancy |
   Outcomes |
(rf_ppoutc) |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,282       62.82       62.82
          1 |      3,718       37.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015