lme models representation

Description

A representation of a linear mixed-effects model using a combination of sparse, symmetric, column-oriented matrices and dense matrices.

Objects from the Class

Objects can be created by calls of the form new("lmeRep", ...) or, more commonly, via the lme1 function.

Slots

Omega:

A list of numeric matrices providing the components of symmetric, positive-definite matrix Omega. Only the upper triangle of each component is used and stored.

D:

A list of the diagonal factors (lower triangle) in the LDL' decomposition of Z'Z+W.

T:

A list of objects of class cscMatrix providing the pairwise cross-tabulation of the grouping factors.

ZZx:

A list of arrays comprising ZtZ

RXX:

A matrix which is the (augmented) RXX component or the corresponding component from the inverse of Z'Z+W

RZX:

A matrix which is the (augmented) RZX component or the corresponding component from the inverse of Z'Z+W

XtX:

The original X'X matrix

ZtX:

The original Z'X matrix

cnames:

Column names of the model matrices.

deviance:

Numeric vector of length 2 containing the deviance corresponding to the maximum likelihood (ML) and REML criteria. This slot's contents are current if status$factored is TRUE.

devComp:

Numeric vector of length 4 giving the components used to calculate the deviance. This slot's contents are current if status$factored is TRUE.

levels:

List of the levels of the grouping factors

nc:

Integer vector with the number of columns in (augmented) model matrices and the number of observations in the model frame.

status:

Logical vector of length 2 indicating if the object has been factored and if the factorization has been inverted.

Methods

chol

signature(x = "lmeRep", pivot = "ANY"): Factor the matrix Z'Z+W

coef

signature(object = "lmeRep"): Extract the parameters that determine the Omega matrices. The optional logical argument unconstr determines the constrained or unconstrained parameterization.

coef<-

signature(object = "lmeRep", value = "numeric"): Assign the parameters that determine the Omega matrices. The optional logical argument unconstr determines the constrained or unconstrained parameterization.

solve

signature(a = "lmeRep", b = "missing"): Invert the decomposed matrices.

See Also

sscCrosstab-class, sscMatrix-class, tscMatrix-class