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arXiv 0904.3295math.STstat.TH
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随机过程上确界的Bernstein型不等式及其在统计中的应用

A Bernstein-type inequality for suprema of random processes with an application to statistics

Yannick Baraud

摘要:

我们使用Talagrand提出的通用链接设备建立指数界的偏差概率的一些上确界的随机过程。然后,给定$\R^{n}$中的一个随机向量$ξ$,其分量是独立的,并且允许一个适当的指数矩,我们导出了$ξ$在$\R^{n}$的线性子空间上的投影的平方欧几里德范数的偏差不等式.最后,我们提供了一个应用程序,这样的不等式的统计,执行模型选择的回归设置时,误差可能是非高斯和收集的模型可能很大。

英文摘要:

We use the generic chaining device proposed by Talagrand to establish exponential bounds on the deviation probability of some suprema of random processes. Then, given a random vector $ξ$ in $\R^{n}$ the components of which are independent and admit a suitable exponential moment, we deduce a deviation inequality for the squared Euclidean norm of the projection of $ξ$ onto a linear subspace of $\R^{n}$. Finally, we provide an application of such an inequality to statistics, performing model selection in the regression setting when the errors are possibly non-Gaussian and the collection of models possibly large.

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