Frequencies for first 10,000 rows of anyimage variable in nhamcsopd2011 dataset :

Any imaging |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,190       81.90       81.90
        Yes |      1,810       18.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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