Frequencies for first 10,000 rows of ld_fint variable in natlterr2010 dataset :

      Fetal |
Intolerance |
        RFP |
615=f_ld_fi |
     ntol R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,656       46.56       46.56
          N |      4,391       43.91       90.47
          U |        849        8.49       98.96
          Y |        104        1.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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