Frequencies for first 10,000 rows of uca_rectal variable in natl2006 dataset :

     Rectal |
Atresia/Ste |
  nosis RFP |
759=f_uca_r |
    ectal U |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      9,852       98.52       98.52
          9 |        148        1.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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