R help - Nov 2009 - standardised effect sizes and confidence intervals for mixed-models

Hello everyone,

I was wondering if anyone knows of an R package which will extract the
standardised effect size (r) and 95% confidence intervals for a single
continuous predictor in a mixed-effects model. For example, I have

model<-lme(damage~car+depth+wet,random=~1|id,data=data)

I need to find out the standardised effect size and confidence intervals of
'car', in a model with 'depth' and 'wet' included as
covariates. I can calculate the effect size manually, but obtaining exact
confidence intervals seems much more tricky. However, I expect somebody has
developed a package for R which will do this at the tap of a button, so any tips
would be appreciated!

Many thanks

Sam Weber

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University of Exeter
Tremough Campus
Penryn
Cornwall TR10 9EZ
UK

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