Frequencies for first 10,000 rows of radther variable in nhamcsopd2011 dataset :

  Radiation |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,960       99.60       99.60
        Yes |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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