Frequencies for first 10,000 rows of rectal variable in natl1990 dataset :

     Rectal |
atresia/ste |
      nosis |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        0.04        0.04
          2 |      9,934       99.34       99.38
          9 |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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