A Test in the Presence of Nuisance Parameters
作者:
MervynJ. Silvapulle,
期刊:
Journal of the American Statistical Association
(Taylor Available online 1996)
卷期:
Volume 91,
issue 436
页码: 1690-1693
ISSN:0162-1459
年代: 1996
DOI:10.1080/01621459.1996.10476739
出版商: Taylor & Francis Group
关键词: Lagrange multiplier test;Likelihood ratio test;One-sided test;Order-restricted inference;Score test
数据来源: Taylor
摘要:
We are interested in testing Ψ =0against an alternative in the presence of some nuisance parameter λ. The usual procedure for such problems is to use a test statistic that is a function of the data only. Letq(λ) denote thep-value at a given value λ. Ifq(λ) does not depend on λ, then in principle we can apply this procedure. However, a major difficulty that arises in many situations is thatq(λ) depends on λ and therefore cannot be used as ap-value. In such cases, the usual approach is to define thep-value as the supremum ofq(λ) over the nuisance parameter space. Because this approach ignores sample information about λ, it may be unnecessarily conservative; this is a serious problem in order restricted inference. To overcome this, I propose the following. Obtain, say, a 99% confidence region for λ under the null hypothesis. Now, for a given λ, letT(λ) be a test statistic andr(λ) be thep-value. The test procedure is to reject the null hypothesis if {0.01 + supremum ofr(λ) over the 99% confidence region for λ} is less than the nominal level such as 0.05. In contrast to the usual procedure, an attractive feature of this procedure is that it allows us to choose a test statistic as a function of λ. A data example is used to illustrate the procedure in a simulation study I observed that this test performed better than the traditional conservative procedure. Although this approach was originally developed for order restricted inference problems, the main results have wide applicability.
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