[R-sig-ME] Modeling and Interpretation Question for Interaction in LMER Output.

[David Duffy]

> The modeling question regards my depiction of time. The amount of elapsed time 
> between participants and testing points is not equal equal. Students in the same classroom 
> will be measured at equal time points, but while one class might have 4 months 
> in between testing, another class might have 7 months. 

In lme, AIUI this would be comparing different correlation structures, as per the example for 
corCAR1().