Frequencies for first 10,000 rows of rectal variable in natlterr1998 dataset :

     Rectal |
atresia/ste |
      nosis |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      9,998       99.98       99.98
          9 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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