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Tests for a change-point. (English) Zbl 0632.62021
The problem is that of testing for a change of the mean in a sequence of independent normal random variables with the same variance. Well-known tests such as likelihood ratio tests, tests based upon cusums of recursive residuals, Pettitt’s test and the Chernoff-Zacks’ statistic are investigated again through their approximate power. For a given level, the computation of the thresholds and of the power functions is done using approximations of boundary crossing probabilities, as in {\it D. Siegmund}’s preceding works, see e.g.: Sequential analysis. Tests and confidence intervals (1985; Zbl 0573.62071). The approximation is much better than with the classical asymptotic theory and some numerical results are given; the conclusion about the comparison of the tests are unsurprising.
Reviewer: J.Deshayes

62F03Parametric hypothesis testing
62F05Asymptotic properties of parametric tests
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