Frequencies for first 10,000 rows of anyimage variable in nhamcsopd2008 dataset :

any imaging |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,968       79.68       79.68
        yes |      2,032       20.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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