# Validation of mixed-effect models

I want to use linear mixed effect model for a set of data.

After using lme4 package and lmer() function and fitting model, I want to validate my model for other period time. But I don't know how to validate my model and generate predicted values.

Do you have any ideas about useful validation method? Is there any command about validation in R software?

• agree with @PeterFlom that this question is a bit too vague. In the meanwhile, you could look at ?predict.merMod ... – Ben Bolker Nov 9 '13 at 21:05