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

   Perineal |
 Laceration |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,078       10.78       10.78
          N |      8,750       87.50       98.28
          U |        162        1.62       99.90
          Y |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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