Frequencies for first 10,000 rows of rf_diab variable in natlterr2013 dataset :

Prepregnanc |
 y Diabetes |
        RFP |
582=f_rf_di |
       ab R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,575       85.75       96.52
          U |        242        2.42       98.94
          Y |        106        1.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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