Tumorigenicity Study on the Effect of Known Carcinogen 2-AAF in Female Mice
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Description of Variables:

cancer   cancer type: 1 = bladder cancer; 2 = liver cancer
trt      treatment type: 0 = control; 1 = high dose (150 ppm)
mth      assessment time in month
DNT      number of mice died with no tumour          
DWT      number of mice died with tumour
SNT      number of mice sacrified with no tumour
SWT      number of mice sacrified with tumour


Reference:

Lindsey J and Ryan L (1993). 
A three-state multiplicative model for rodent tumorigenicity experiments. 
Journal of the Royal Statistical Society: Series C (Applied Statistics), 42(2): 283-300.


> mice <- read.table("mice.dat", header=T)

> dim(mice)
  [1] 102   7

> mice[1:6,]
  cancer trt mth DNT DWT SNT SWT
       1   0   4   0   1   0   0
       1   0   5   1   1   0   0
       1   0   7   1   1   0   0
       1   0   8   1   0   0   0
       1   0  10   0   0  23   0
       1   0  13   0   0  24   0