Frequencies for first 10,000 rows of hernia variable in natl1992 dataset :

Diaphragmat |
  ic hernia |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |      9,996       99.96       99.97
          9 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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