Message-ID: <loom.20120507T004002-303@post.gmane.org>
Date: 2012-05-06T22:40:39Z
From: Ben Bolker
Subject: Interaction plot between 2 continuous variables
Bert Gunter <gunter.berton <at> gene.com> writes:
>
> This almost certainly has nothing to do with mixed effects models per
> se. x1 and x2 are probably ( if what you see is not due to a few
> unusual values) correlated, so the standard decomposition into main
> and interaction effects does not have the usual meaningful
> interpretation (e,g, that you would get from orthogonal regressors).
See also
http://stats.stackexchange.com/questions/5450/
what-if-interaction-wipes-out-my-direct-effects-in-regression/
(URL broken to make gmane happy)