Multiple solutions to the likelihood equations in the Behrens-Fisher problem

Details Multiple solutions to the likelihood equations in the Behrens-Fisher problem Multiple solutions to the likelihood equations in the Behrens-Fisher problem

2007-05-31

arxiv.org/abs/0705.4516v1

Statistics & Probability Letters 2008, Vol. 78, No. 18, 3288-3293

Mathematics

Statistics Theory

Scientific paper

10.1016/j.spl.2008.06.012

The Behrens-Fisher problem concerns testing the equality of the means of two normal populations with possibly different variances. The null hypothesis in this problem induces a statistical model for which the likelihood function may have more than one local maximum. We show that such multimodality contradicts the null hypothesis in the sense that if this hypothesis is true then the probability of multimodality converges to zero when both sample sizes tend to infinity. Additional results include a finite-sample bound on the probability of multimodality under the null and asymptotics for the probability of multimodality under the alternative.

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