[R] residual plots for lmer in lme4 package

[Gregor Gorjanc]

John Maindonald <john.maindonald <at> anu.edu.au> writes:
...
> The issue of checking for normality of effects in multi-level
> models has not been very much researched, as far as I can
> tell.  The function residuals()  gives residuals that adjust for
> all except the "highest" level of random effects.  Depending
> on the relative magnitudes of the variance components,
> whether or not these "residuals" are anywhere near normal
> may not be of much or any consequence.ž

For what it is worth I have came across this paper just recently:

http://www3.interscience.wiley.com/cgi-bin/abstract/114280441

Gregor