W fx d4ju

is the Nelson-Aalen estimate of the cumulative hazard function Ak in group j for event k. Then, with finite sample size, akk is not the classical variance estimator (8); nevertheless, since, under Ho, for j = A,B, Akj converges in probability to Ak as does Ak, we can conclude that akk converges in probability to °ik.

A test statistic for H0 : {¿A = AB = Ai, AA = ABB = A2 on [0,r]} is (LRi,LR2) S~i (LRi, LR2)', whose asymptotic distribution under Ho is a chi-square distribution with two degrees of freedom.

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