Frequencies for first 10,000 rows of f_rf_ppo variable in natlterr2007 dataset :

       Poor |
  Pregnancy |
   Outcomes |
(rf_ppoutc) |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,170       61.70       61.70
          1 |      3,830       38.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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