lme4 (version 0.4-7)

pdNatural-class: Class "pdNatural", positive-definite matrices

Description

A class of general, positive-definite symmetric matrices parameterized by the logarithm of the diagonal elements and Fisher's z transformation of the correlations.

Objects from the Class

Objects can be created by calls of the form new("pdNatural", ...) or by the generic constructor function pdNatural. Frequently the constructor is given a formula only, creating an uninitialized pdNatural object which is later assigned a value.

pdNatural objects are primarily used to represent the variance-covariance matrix or the precision matrix of random-effects terms in mixed-effects models.

Extends

Class "pdMat", directly.

See Also

pdMat-class