Frequencies for first 10,000 rows of rf_ppoutc variable in natlterr2011 dataset :

       Poor |
  Pregnancy |
Outcome RFP |
588=f_rf_pp |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,536       25.36       25.36
          N |      6,354       63.54       88.90
          U |      1,074       10.74       99.64
          Y |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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