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

Prepregnanc |
 y Diabetes |
        RFP |
582=f_rf_di |
       ab R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,656       46.56       46.56
          N |      4,528       45.28       91.84
          U |        767        7.67       99.51
          Y |         49        0.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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