This function extracts the full covariance matrices from a mixed/hierarchical
linear model fit using
a fitted model object of class
A list of matrices is returned.
D contains the covariance matrix of the random effects.
V contains the covariance matrix of the response.
X contains the fixed-effect model matrix.
Z contains the random-effect model matrix.
Adam Loy email@example.com
This method has been adapted from the method
mgcv::extract.lme.cov in the
mgcv package, written by Simon
N. Wood firstname.lastname@example.org.
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