Frequencies for first 10,000 rows of anyimage variable in nhamcsed2014 dataset :

Any imaging |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      5,580       55.80       55.80
        Yes |      4,420       44.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017