Frequencies for first 10,000 rows of rf_gdiab variable in natl2014 dataset :

Gestational |
 Diabetes Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,085       90.85       90.85
          U |        128        1.28       92.13
          Y |        787        7.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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