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arXiv 0911.5482stat.MLmath.STstat.TH
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稀疏经验贝叶斯分析(SEBA)

Sparse Empirical Bayes Analysis (SEBA)

Natalia Bochkina, Ya'acov Ritov

摘要:

我们考虑了$n$独立稀疏回归问题的联合处理。每一个都是基于来自$y_{i1}=x_{i1}\tβ_i+\eps_{i1}$、$y_{i1}\in \R$、$x_{i 1}\in\R^p$、$i=1,...,n$和$\eps_{i1}\dist N(0,\sig^2)$的$m$ \iid观测的样本$(y_{i1},x_{i1})...,(y_{im},x_{im})$。$p$足够大,使得经验风险最小化不一致。我们考虑三种可能的扩展的套索估计来处理这个问题,套索,组套索和环套索,每个利用不同的假设,这些问题是如何相关的。对于每个估计,我们给出了贝叶斯解释,我们提出了持久性分析和非渐近误差界的基础上限制特征值型假设。

英文摘要:

We consider a joint processing of $n$ independent sparse regression problems. Each is based on a sample $(y_{i1},x_{i1})...,(y_{im},x_{im})$ of $m$ \iid observations from $y_{i1}=x_{i1}\tβ_i+\eps_{i1}$, $y_{i1}\in \R$, $x_{i 1}\in\R^p$, $i=1,...,n$, and $\eps_{i1}\dist N(0,\sig^2)$, say. $p$ is large enough so that the empirical risk minimizer is not consistent. We consider three possible extensions of the lasso estimator to deal with this problem, the lassoes, the group lasso and the RING lasso, each utilizing a different assumption how these problems are related. For each estimator we give a Bayesian interpretation, and we present both persistency analysis and non-asymptotic error bounds based on restricted eigenvalue - type assumptions.

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