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arXiv 2109.04657stat.ME
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高维成分数据的主成分分析

Principal component analysis for high-dimensional compositional data

Jingru Zhang, Wei Lin

摘要:

高维成分数据的降维在许多领域有着重要的作用,其中基协方差阵的主成分分析具有重要的科学意义。然而,在实践中,基础变量是潜在的,很少观察到,和标准技术的主成分分析是不够的组成数据,因为单纯形约束。为了解决这一难题,我们将中心对数比组成协方差的主子空间与基协方差的主子空间联系起来,并证明了基协方差的主子空间在一定的子空间稀疏性假设下具有发散维数.这一有趣的降维现象使我们能够利用样本中心对数比协方差提出主子空间估计方法。我们还得到了非渐近误差界的子空间估计,表现出识别和估计之间的权衡。此外,我们还发展了有效的近似交替方向乘子算法来解决非凸和非光滑优化问题。仿真结果表明,所提出的方法执行以及与已知的基础上的预言方法。通过对统计人员的词汇使用模式的分析,说明了它们的有用性。

英文摘要:

Dimension reduction for high-dimensional compositional data plays an important role in many fields, where the principal component analysis of the basis covariance matrix is of scientific interest. In practice, however, the basis variables are latent and rarely observed, and standard techniques of principal component analysis are inadequate for compositional data because of the simplex constraint. To address the challenging problem, we relate the principal subspace of the centered log-ratio compositional covariance to that of the basis covariance, and prove that the latter is approximately identifiable with the diverging dimensionality under some subspace sparsity assumption. The interesting blessing-of-dimensionality phenomenon enables us to propose the principal subspace estimation methods by using the sample centered log-ratio covariance. We also derive nonasymptotic error bounds for the subspace estimators, which exhibits a tradeoff between identification and estimation. Moreover, we develop efficient proximal alternating direction method of multipliers algorithms to solve the nonconvex and nonsmooth optimization problems. Simulation results demonstrate that the proposed methods perform as well as the oracle methods with known basis. Their usefulness is illustrated through an analysis of word usage pattern for statisticians.

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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