Frequencies for first 10,000 rows of anyimage variable in nhamcsed2012 dataset :

Any imaging |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      5,767       57.67       57.67
        Yes |      4,233       42.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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