Frequencies for first 10,000 rows of otherxry variable in nhamcsed2004 dataset :

other x-ray |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,897       88.97       88.97
        yes |      1,103       11.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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