Frequencies for first 10,000 rows of brstslfx variable in nhamcsopd2000 dataset :

     breast |
  self-exam |
 couns/educ |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,852       98.52       98.52
          1 |        148        1.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016