Data on 30 rats used to assess the efficacy of BNCT 
See Problem 7.8.7
Data can be read in free format. The variables represented in the dataset are as follows: 

Treatment (1=untreated, 2=radiated, 3=radiated + BPA) 
Death time or on-study time, days 
Death indicator (1=dead, 0=alive) 
THE DATA 
1 20 1
1 21 1
1 23 1
1 24 1
1 24 1
1 26 1
1 26 1
1 27 1
1 28 1
1 30 1
2 26 1
2 28 1
2 29 1
2 29 1
2 30 1
2 30 1
2 31 1
2 31 1
2 32 1
2 35 0
3 31 1
3 32 1
3 34 1
3 35 1
3 36 1
3 38 1
3 38 1
3 39 1
3 42 0
3 42 0