α
0.5 0.598 0.028
1.0 0.548 0.096
1.5 0.515 0.173
2.0 0.490 0.235
2.5 0.466 0.277
3.0 0.439 0.299
Table 1: Asymptotic Relative Efficience of the Estimators and .The study was conducted with 2=0, k=2 groups m1= m2=20 individuals per group; The follow-up times are identical for the two groups.