# hatTrace

0th

Percentile

##### Extract the trace of the hat' matrix

Extract the trace of the hat' matrix from a fitted linear mixed model or generalized linear mixed model.

Keywords
models, methods
##### 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.

• hatTrace
##### Examples
hatTrace(lmer(Reaction ~ Days + (1|Subject) + (0+Days|Subject), sleepstudy))
Documentation reproduced from package lme4, version 0.99875-9, License: GPL version 2 or later

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