Frequencies for first 10,000 rows of rf_gdiab variable in natlterr2014 dataset 

Gestational |
 Diabetes Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,570       85.70       96.47
          U |         76        0.76       97.23
          Y |        277        2.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016