By Mohsen Pourahmadi

Methods for estimating sparse and big covariance matrices

Covariance and correlation matrices play primary roles in each element of the research of multivariate information accrued from quite a few fields together with company and economics, wellbeing and fitness care, engineering, and environmental and actual sciences. High-Dimensional Covariance Estimation provides available and accomplished insurance of the classical and smooth techniques for estimating covariance matrices in addition to their purposes to the quickly constructing components mendacity on the intersection of records and desktop learning.

Recently, the classical pattern covariance methodologies were changed and more desirable upon to satisfy the desires of statisticians and researchers facing huge correlated datasets. High-Dimensional Covariance Estimation specializes in the methodologies in keeping with shrinkage, thresholding, and penalized probability with purposes to Gaussian graphical versions, prediction, and mean-variance portfolio administration. The e-book is based seriously on regression-based rules and interpretations to attach and unify many present equipment and algorithms for the task.

High-Dimensional Covariance Estimation positive factors chapters on:

  • Data, Sparsity, and Regularization
  • Regularizing the Eigenstructure
  • Banding, Tapering, and Thresholding
  • Covariance Matrices
  • Sparse Gaussian Graphical Models
  • Multivariate Regression

The publication is a perfect source for researchers in statistics, arithmetic, company and economics, computing device sciences, and engineering, in addition to an invaluable textual content or complement for graduate-level classes in multivariate research, covariance estimation, statistical studying, and high-dimensional facts analysis.

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Additional resources for High-Dimensional Covariance Estimation: With High-Dimensional Data

Example text

Ii are nonnegative definite. (c) all eigenvalues of are nonnegative. (d) there exists a matrix A such that = AA . 5) (e) there exists a lower triangular matrix L such that = LL . 6) (f) there exist vectors u1 , · · · , u p in R p such that σij = ui u j . Proof of the last four parts of the theorem relies on the spectral decomposition, square-root, and the Cholesky decomposition of a symmetric matrix, topics which are discussed later in this chapter. In view of part (f), is also called the Gram matrix of the vectors u1 , · · · , u p .

8) which gets larger for larger p (higher-dimensional data) and for smaller ||μ||2 (sparser parameter vector). Indeed, this useful interplay between sparsity and highdimensionality was the first indication that in higher dimensions it is much easier to beat the standard MLE in the presence of parameter sparsity. Unfortunately, μβ0 is not really an estimator since it depends on the unknown ||μ||2 . A reasonable estimator of the shrinkage parameter β0 can be obtained by p replacing ||μ||2 by its unbiased estimator i=1 Yi2 − p, which leads to the estimator p μ0 = (1 − ||Y ||2 )Y .

C) Compute θi j = var (Yi − μi )(Y j − μ j ) . CHAPTER 3 COVARIANCE MATRICES In this chapter, we provide a potpourri of some basic mathematical and statistical results on covariance matrices which are of interest both in the classical multivariate statistics and in the modern high-dimensional data analysis. Included topics are spectral, Cholesky, and singular value decompositions; structured covariance matrices, principal component and factor analysis; generalized linear models (GLMs); and aspects of Bayesian analysis of covariance matrices.

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