Frequencies for first 10,000 rows of breast variable in namcs2012 dataset :

Breast exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,700       97.00       97.00
        Yes |        300        3.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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