Frequencies for first 10,000 rows of anyimage variable in nhamcsed2008 dataset :

any imaging |
    service |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      5,409       54.09       54.09
        yes |      4,591       45.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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