Frequencies for first 10,000 rows of anyimage variable in nhamcsopd2006 dataset :

any imaging |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,312       83.12       83.12
        Yes |      1,688       16.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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