Frequencies for first 10,000 rows of ld_fint variable in natl2013 dataset :

      Fetal |
Intolerance |
        RFP |
615=f_ld_fi |
     ntol R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,550       95.50       95.50
          U |        153        1.53       97.03
          Y |        297        2.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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