Frequencies for first 10,000 rows of catscan variable in namcs2011 dataset :

    CT Scan |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,827       98.27       98.27
        Yes |        173        1.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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