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arXiv 2201.03659stat.ME
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基于多变量Winsorization的鲁棒图套索算法

Robust graphical lasso based on multivariate Winsorization

Ginette Lafit, Francisco Nogales, Marcelo Ruiz, Ruben Zamar

摘要:

我们提出了使用一个强大的协方差估计的基础上多变量Winsorization的背景下,塔尔-穆勒-韦伯框架稀疏估计的精度矩阵的高斯图形模型。同样Croux-Ollerer的精度矩阵估计,我们提出的估计达到最大有限样本崩溃点0.5下细胞污染。我们进行了广泛的蒙特卡罗模拟研究,以评估我们的性能和目前现有的建议。我们发现我们的算法在精度矩阵的估计和图的恢复方面具有竞争性。我们证明了所提出的方法在乳腺癌数据的实际应用中的实用性。

英文摘要:

We propose the use of a robust covariance estimator based on multivariate Winsorization in the context of the Tarr-Muller-Weber framework for sparse estimation of the precision matrix of a Gaussian graphical model. Likewise Croux-Ollerer's precision matrix estimator, our proposed estimator attains the maximum finite sample breakdown point of 0.5 under cellwise contamination. We conduct an extensive Monte Carlo simulation study to assess the performance of ours and the currently existing proposals. We find that ours has a competitive behavior, regarding the the estimation of the precision matrix and the recovery of the graph. We demonstrate the usefulness of the proposed methodology in a real application to breast cancer data.

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