Frequencies for first 10,000 rows of catscan variable in nhamcsed2007 dataset :

any ct scan |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,564       85.64       85.64
        yes |      1,436       14.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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