Frequencies for first 10,000 rows of rectal variable in linkco1991us_num dataset :

     Rectal |
atresia/ste |
      nosis |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         14        0.14        0.14
          2 |      9,713       97.13       97.27
          9 |        273        2.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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