Data on 42 children with acute leukemia (Clinical trial: 6-MP versus placebo 
See Section 1.2
Data can be read in free format. The variables represented in the dataset are as follows: 

Pair 
Remission status at randomization (1=partial, 2=complete) 
Time to relapse for placebo patients, months 
Time to relapse for 6-MP patients, months 
Relapse indicator (0=censored, 1=relapse) for 6-MP patients
NOTE: All placebo patients relapsed 

Reference Freireich et al. Blood 21(1963): 699-716. 
THE DATA 
1 1 1 10 1
2 2 22 7 1
3 2 3 32 0
4 2 12 23 1
5 2 8 22 1
6 1 17 6 1
7 2 2 16 1
8 2 11 34 0
9 2 8 32 0
10 2 12 25 0
11 2 2 11 0
12 1 5 20 0
13 2 4 19 0
14 2 15 6 1
15 2 8 17 0
16 1 23 35 0
17 1 5 6 1
18 2 11 13 1
19 2 4 9 0
20 2 1 6 0
21 2 8 10 0