Frequencies for first 10,000 rows of anyimage variable in nhamcsed2007 dataset :

any imaging |
    service |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      5,312       53.12       53.12
        yes |      4,688       46.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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