Frequencies for first 10,000 rows of breast variable in nhamcsopd2000 dataset :

breast exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,501       95.01       95.01
          1 |        499        4.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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