Frequencies for first 10,000 rows of mm_uhyst variable in natl2015 dataset :

  Unplanned |
Hysterectom |
    y Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,915       99.15       99.15
          U |         79        0.79       99.94
          Y |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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