Frequencies for first 10,000 rows of catscan variable in nhamcsed2005 dataset :

   cat scan |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,862       88.62       88.62
        yes |      1,138       11.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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