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

      Fetal |
Intolerance |
        RFP |
615=f_ld_fi |
     ntol R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,536       25.36       25.36
          N |      6,239       62.39       87.75
          U |      1,092       10.92       98.67
          Y |        133        1.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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