Frequencies for first 10,000 rows of breast variable in nhamcsopd2011 dataset :

Breast exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,335       93.35       93.35
        Yes |        665        6.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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