Frequencies for first 10,000 rows of rf_gest variable in natl2013 dataset :

Gestational |
   Diabetes |
        RFP |
583=f_rf_gd |
      iab R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      8,992       89.92       89.92
          U |        167        1.67       91.59
          Y |        841        8.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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