Frequencies for first 10,000 rows of breast variable in nhamcsopd1995 dataset :

breast exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,393       93.93       93.93
          1 |        607        6.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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