Frequencies for first 10,000 rows of anyimage variable in nhamcsed2009 dataset :

any imaging |
    service |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,518       55.18       55.18
          1 |      4,482       44.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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