Extract the trace of the `hat' matrix from a fitted linear mixed model
or generalized linear mixed model.
Usage
hatTrace(x)
Arguments
x
a fitted model object that inherits from the
mer class
Value
The trace of the hat matrix at the parameter estimates. This is a
measure of the complexity of the model, conditional on the relative
variance components.
References
Spiegelhalter, D.J., Best, N.G., Carlin, B.P. and van der
Linde, A. (2002), "Bayesian measures of model complexity and fit (with
discussion)", Journal of the Royal Statistical Society, part B,
64, (4), 583-639.