多元正态均值的一个新的重中心置信球
A new recentered confidence sphere for the multivariate normal mean
摘要:
我们描述了一个新的重中心置信球的平均值,θ,一个多元正态分布。该球体以正部分James-Stein估计器为中心,半径是数据向量的范数的分段三次Hermite插值多项式函数。该半径函数通过在数值上最小化该置信球在θ = 0处的缩放的预期体积来确定,该置信球受到覆盖约束。我们使用Casella和Hwang [3]推导的计算方便的公式来计算重中心置信球的覆盖概率。Casella和Hwang,同前,描述了一个也以正部分James-Stein估计量为中心的重中心置信球,但半径函数由经验贝叶斯考虑因素确定。我们的新的重中心的信心领域相比,这个信心领域,在最小的覆盖概率和规模的预期量在θ = 0。
英文摘要:
We describe a new recentered confidence sphere for the mean, theta, of a multivariate normal distribution. This sphere is centred on the positive-part James-Stein estimator, with radius that is a piecewise cubic Hermite interpolating polynomial function of the norm of the data vector. This radius function is determined by numerically minimizing the scaled expected volume, at theta = 0, of this confidence sphere, subject to the coverage constraint. We use the computationally-convenient formula, derived by Casella and Hwang [3], for the coverage probability of a recentered confidence sphere. Casella and Hwang, op. cit., describe a recentered confidence sphere that is also centred on the positive-part James-Stein estimator, but with radius function determined by empirical Bayes considerations. Our new recentered confidence sphere compares favourably with this confidence sphere, in terms of both the minimum coverage probability and the scaled expected volume at theta = 0.
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