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Higher-order asymptotic normality of approximations to the modified signed likelihood ratio statistic for regular models. (English) Zbl 1126.62013
Summary: Approximations to the modified signed likelihood ratio statistic are asymptotically standard normal with error of order \(n^{ - 1}\), where \(n\) is the sample size. Proofs of this fact generally require that the sufficient statistic of the model can be written as \((\widehat{\theta}, a)\), where \(\widehat{\theta}\) is the maximum likelihood estimator of the parameter \(\theta \) of the model and \(a\) is an ancillary statistic. This condition is very difficult or impossible to verify for many models. However, calculation of the statistics themselves does not require this condition. The goal of this paper is to provide conditions under which these statistics are asymptotically normally distributed to order \(n^{ - 1}\) without making any assumption about the sufficient statistic of the model.

62F05 Asymptotic properties of parametric tests
62B05 Sufficient statistics and fields
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