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

   Ruptured |
   Uterus Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,808       98.08       98.08
          U |        184        1.84       99.92
          Y |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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