Frequencies for first 10,000 rows of rf_diab variable in natlterr2011 dataset :

Prepregnanc |
 y Diabetes |
        RFP |
582=f_rf_di |
       ab R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,536       25.36       25.36
          N |      6,337       63.37       88.73
          U |      1,074       10.74       99.47
          Y |         53        0.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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