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arXiv 1803.07548stat.ME
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基于惩罚概率主成分分析的维度学习研究

Exploring dimension learning via a penalized probabilistic principal component analysis

Wei Q. Deng, Radu V. Craiu

摘要:

建立数据的低维表示导致有效的数据学习策略。在许多情况下,需要显式地说明并从数据中估计降维。我们探讨了有限样本中的维数估计作为一个约束优化问题,其中估计的维数是一个最大化的惩罚配置文件的概率主成分分析的框架内的似然准则。与其他惩罚最大化问题,需要一个“最佳”的惩罚调整参数,我们提出了一个数据平均的过程,估计尺寸出现在一个合理的惩罚参数范围内的最有利的选择。所提出的启发式相比,大量的替代标准在模拟和基因表达数据的应用。广泛的模拟研究表明,没有一种方法均匀地支配其他的,并强调了在选择统计方法进行维度学习时特定学科知识的重要性。我们的应用结果还表明,基因表达数据具有比之前认为的更高的内在维度。总体而言,我们提出的启发式取得了很好的平衡,是模型假设适度偏离时的选择方法。

英文摘要:

Establishing a low-dimensional representation of the data leads to efficient data learning strategies. In many cases, the reduced dimension needs to be explicitly stated and estimated from the data. We explore the estimation of dimension in finite samples as a constrained optimization problem, where the estimated dimension is a maximizer of a penalized profile likelihood criterion within the framework of a probabilistic principal components analysis. Unlike other penalized maximization problems that require an "optimal" penalty tuning parameter, we propose a data-averaging procedure whereby the estimated dimension emerges as the most favourable choice over a range of plausible penalty parameters. The proposed heuristic is compared to a large number of alternative criteria in simulations and an application to gene expression data. Extensive simulation studies reveal that none of the methods uniformly dominate the other and highlight the importance of subject-specific knowledge in choosing statistical methods for dimension learning. Our application results also suggest that gene expression data have a higher intrinsic dimension than previously thought. Overall, our proposed heuristic strikes a good balance and is the method of choice when model assumptions deviated moderately.

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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