Frequencies for first 10,000 rows of mm_uhyst variable in natl2013 dataset :

  Unplanned |
Hysterectom |
          y |
625=f_mm_uh |
     ystr R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,770       97.70       97.70
          U |        227        2.27       99.97
          Y |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015