Frequencies for first 10,000 rows of me_trial variable in natl2015 dataset :

   Trial of |
      Labor |
  Attempted |
        (if |
cesarean) Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      1,347       13.47       13.47
          U |         57        0.57       14.04
          X |      7,717       77.17       91.21
          Y |        879        8.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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