sorry for not being more specific. I would like to use R to get a prediction (with standard error) of the response in a mixed model at selected values of the fixed-effects factors. Hence, in a mixed model, say, for response body size with, say, fixed factors sex and age, I would like to get a prediction of size for each sex and at selected ages such as 5, 10, 15; and I want a SE for that prediction as well.
This can be produced in the GenStat package using the VPREDICT directive or for lme-objects by predict(lmeresult, newdata, se=TRUE), but I have not found out so far how predictions for the response under a mixed model in R can be obtained.
Thanks for all,
kind regards --
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