Frequencies for first 10,000 rows of catscan variable in nhamcsed2006 dataset :

   cat scan |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,896       88.96       88.96
        yes |      1,104       11.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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