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arXiv 1006.0123math.STstat.TH
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邻域M-估计量的MSE高阶渐近性的结果

Consequences of Higher Order Asymptotics for the MSE of M-estimators on Neighborhoods

Peter Ruckdeschel

摘要:

在Ruckdeschel[10]中,我们导出了位置M-估计量在适当稀疏、收缩疏失误差邻域上的最大均方误差(MSE)的渐近展开。在本文中,我们编译了这个结果的几个结果:使用与MSE相同的技术,我们分别根据Huber[68]和Rieder[80 b]中的过冲/下冲概率确定风险的高阶表达式。对于MSE问题,我们解决了二阶鲁棒最优性问题:在对称情况下,我们再次找到Hampel形式的二阶最优得分,但是比一阶渐近性小O(n^{-1/2})-更小的裁剪高度c。这个较小的c仅通过LO(1/n)提高MSE。对于未知污染半径的情况,我们将Rieder等人[08]中引入的极大极小无效率推广到我们的二阶设置。在所有风险最大化的污染中,我们确定一个“最无害”的污染。通过这种方式,我们量化了Huber[97]定义中的“可检测性极限”,以达到鲁棒性的目的。

英文摘要:

In Ruckdeschel[10], we derive an asymptotic expansion of the maximal mean squared error (MSE) of location M-estimators on suitably thinned out, shrinking gross error neighborhoods. In this paper, we compile several consequences of this result: With the same techniques as used for the MSE, we determine higher order expressions for the risk based on over-/undershooting probabilities as in Huber[68] and Rieder[80b], respectively. For the MSE problem, we tackle the problem of second order robust optimality: In the symmetric case, we find the second order optimal scores again of Hampel form, but to an O(n^{-1/2})-smaller clipping height c than in first order asymptotics. This smaller c improves MSE only by LO(1/n). For the case of unknown contamination radius we generalize the minimax inefficiency introduced in Rieder et al. [08] to our second order setup. Among all risk maximizing contaminations we determine a "most innocent" one. This way we quantify the "limits of detectability" in Huber[97]'s definition for the purposes of robustness.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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