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

   Perineal |
 Laceration |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,659       96.59       96.59
          U |        184        1.84       98.43
          Y |        157        1.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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