[R] lme library

From: <roberta_varriale_at_ds.unifi.it>
Date: Tue, 18 Mar 2008 17:24:12 +0100 (CET)


Dear authors,
I’m an Italian PhD student and I’m dealing with linear mixed models.

I’d like to use your lme library, but I have a problem.

I’m able to estimate a null model.
For example, using SAS data, I can estimate the model: lme(y ~ 1, data = Mississippi, random = ~ 1|influent, method="ML")

As suggested in the literature I want to “test” the significance of the second level variance. So, I would like also to estimate a linear model without random effects. Is it possible with your library? In the description of the function lme I found that the random part is optional, but I don't know how to remove it.

I tried also other R functions (as glm, lme, etc), but I don’t find any function that implements the models with the method “ML”.

Can you help me, please?

Really thanks for you help,
Bests
Roberta Varriale

Ps I prefer your new look!



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