is.positive.definite

This function tests whether all eigenvalues of a symmetric matrix are positive. See <code>help("is.positive.definite")</code> from package <code>corpcor</code>.

covariance

positive definite

Fit quantile regression models for independent and
        hierarchical data

Marco Geraci

lqmm

Linear Quantile Mixed Models

is.positive.definite function

Juliane Schaefer, Rainer Opgen-Rhein, Verena Zuber, A. Pedro Duarte Silva and Korbinian Strimmer. (2011). corpcor: Efficient Estimation of Covariance and (Partial) Correlation. R package version 1.6.0. <url>http://CRAN.R-project.org/package=corpcor</url>

is.positive.definite: Test for Positive Definiteness

Description

Arguments

source