Frequencies for first 10,000 rows of me_trial variable in natlterr2015 dataset :

   Trial of |
      Labor |
  Attempted |
        (if |
cesarean) Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,078       10.78       10.78
          N |      2,142       21.42       32.20
          U |        306        3.06       35.26
          X |      5,515       55.15       90.41
          Y |        959        9.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016