getGB

(object) with list-type structure, e.g. <code>VCA</code> object fitted by ANOVA
or a premature <code>VCA</code> object fitted by REML

(numeric) values < 'tol' will be considered being equal to zero


Compute variance covariance matrix of variance components of a linear mixed model
via the method stated in Giesbrecht and Burns (1985).



ANOVA and REML estimation of linear mixed models is implemented, once following
Searle et al. (1991, ANOVA for unbalanced data), once making use of the 'lme4' package.
The primary objective of this package is to a perform variance component analysis (VCA)
according to CLSI EP05-A3 guideline "Evaluation of Precision of Quantitative Measurement
Procedures" (2014). There are plotting methods for visualization of an experimental design,
plotting random effects and residuals. For ANOVA type estimation two methods for computing
ANOVA mean squares are implemented (SWEEP and quadratic forms). The covariance matrix of
variance components can be derived, which is used in estimating confidence intervals. Linear
hypotheses of fixed effects and LS means can be computed. LS means can be computed at specific
values of covariables and with custom weighting schemes for factor variables. See ?VCA for a
more comprehensive description of the features.

getGB: Giesbrecht & Burns Approximation of the Variance-Covariance Matrix of Variance Components.

Description

Usage

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Details

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See Also