Frequencies for first 10,000 rows of castage variable in nhamcsopd2007 dataset :

      stage of |
     patient's |
        cancer |      Freq.     Percent        Cum.
---------------+-----------------------------------
       unknown |        311        3.11        3.11
not applicable |      9,484       94.84       97.95
       in situ |         25        0.25       98.20
         local |        102        1.02       99.22
      regional |         52        0.52       99.74
       distant |         26        0.26      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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