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

Any imaging |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      5,666       56.66       56.66
        Yes |      4,334       43.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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