arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.6534math.STstat.TH
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可加回归中模型的选择与分量的估计

Model selection and estimation of a component in additive regression

Xavier Gendre

摘要:

令$Y\in\R^n$是具有均值$s$和协方差矩阵$σ^2P_n\tra{P_n}$的随机向量,其中$P_n$是某个已知的$n\times n$ -矩阵。我们构造了一个统计过程来估计$s$以及在$Y$或高斯假设的矩条件下。这两种病例均为已知或未知$σ^2$。我们的方法是免费的$s$的任何先验假设,是基于非渐近模型选择方法。给定线性空间集合$\{S_m,\ m\in\M\}$,对任意的$m\in\M$,考虑$s$在$S_m$中的最小二乘估计量$\hat{s}_m$.考虑罚函数在$S_m$的维数上不是线性的,我们选择一些$\hat{m}\in\M$,以得到二次风险尽可能接近$\hat{s}_m$的风险中最小风险的估计量$\hat{s}_{\hat{m}}$.证明了$\hat{s}_{\hat{m}}$的非渐近预言型不等式和极大极小收敛速度。一个特别注意的是在加性模型中的非参数分量的估计。最后,我们进行了模拟研究,以说明我们的估计在实践中的表现。

英文摘要:

Let $Y\in\R^n$ be a random vector with mean $s$ and covariance matrix $σ^2P_n\tra{P_n}$ where $P_n$ is some known $n\times n$-matrix. We construct a statistical procedure to estimate $s$ as well as under moment condition on $Y$ or Gaussian hypothesis. Both cases are developed for known or unknown $σ^2$. Our approach is free from any prior assumption on $s$ and is based on non-asymptotic model selection methods. Given some linear spaces collection $\{S_m,\ m\in\M\}$, we consider, for any $m\in\M$, the least-squares estimator $\hat{s}_m$ of $s$ in $S_m$. Considering a penalty function that is not linear in the dimensions of the $S_m$'s, we select some $\hat{m}\in\M$ in order to get an estimator $\hat{s}_{\hat{m}}$ with a quadratic risk as close as possible to the minimal one among the risks of the $\hat{s}_m$'s. Non-asymptotic oracle-type inequalities and minimax convergence rates are proved for $\hat{s}_{\hat{m}}$. A special attention is given to the estimation of a non-parametric component in additive models. Finally, we carry out a simulation study in order to illustrate the performances of our estimators in practice.

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