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

   Ruptured |
   Uterus Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,704       87.04       97.81
          U |        216        2.16       99.97
          Y |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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