[R-sig-ME] Graphing interaction terms in LME4, glmer

[Shane Gleason]

Hello everyone,

I am working with lme4, specifically the glmer command.  In a multilevel 
model I have an interaction term which is significant. However, with my 
discipline we stress that an interaction term cannot be evaluated by p 
value alone and one must reference a graphical display of the 
interaction, with confidence intervals drawn around it.

That is to say if the interaction is X*Z then the interaction might be 
significant when X=1 and Z=3, but may not be significant if X=4 and Z=9.

I have searched around and I can't seem to find any indication of how to 
graph out the interaction (though I see some references to it for lmer 
(but never glmer)).  So, my question is two-part- 1: Does this 
assumption about how interaction terms work hold for MLMs?  2: If the 
answer to 1 is yes, does anyone know of software I can use to graph out 
these interactions?

Thanks,

Shane

-- 
Shane Gleason
Doctoral Candidate
Southern Illinois University:Carbondale
Department of Political Science
Faner 3172