Frequencies for first 10,000 rows of breast variable in nhamcsopd2005 dataset :

breast exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,427       94.27       94.27
        yes |        573        5.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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