Frequencies for first 10,000 rows of catscan variable in nhamcsed2013 dataset :

    CT scan |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,606       86.06       86.06
        Yes |      1,394       13.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016