Frequencies for first 10,000 rows of breast variable in nhamcsopd2006 dataset :

breast exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,506       95.06       95.06
        Yes |        494        4.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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