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

   Perineal |
 Laceration |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,670       86.70       97.47
          U |        216        2.16       99.63
          Y |         37        0.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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