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

      Fetal |
Intolerance |
        RFP |
615=f_ld_fi |
     ntol R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,163       61.63       61.63
          N |      3,756       37.56       99.19
          U |          1        0.01       99.20
          Y |         80        0.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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