Frequencies for first 10,000 rows of breast variable in nhamcsopd1997 dataset :

breast exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,294       92.94       92.94
          1 |        706        7.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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