Frequencies for first 10,000 rows of breast variable in nhamcsopd2008 dataset :

breast exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,524       95.24       95.24
        yes |        476        4.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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