On the Behaviour of Wald Statistics for the Disjunction of Two Regular Hypotheses
两个正则假设的析取下 Wald 统计量的行为AI 解读 ↓
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SUMMARY Occasionally hypotheses arise which, although not themselves regular, have the logical structure of the disjunction of two, or in general several, regular hypotheses. An example of such a hypothesis is that of collapsibility in a three-way contingency table as defined by Whittemore. When such a hypothesis is to be tested, a Wald test appears, superficially, to offer a convenient solution. However, closer inspection reveals that the irregularity intrinsic to such problems precludes the regularity conditions required for the valid construction of a Wald test statistic. The purpose of this paper is to describe explicitly the nature of the irregularity and its effect on the asymptotic behaviour of the Wald test statistic.