Dear mixed modelers,
If I have interactions between a categorical
covariate and a random-effects grouping factor.
How can I test formally the correlations?
For example
data(Machines, package = "MEMSS")
fm2aM <- lmer(score ~ Machine + (0 + Machine|Worker), Machines)
Random effects:
Groups Name Variance Std.Dev. Corr
Worker MachineA 13.81574 3.71695
MachineB 61.94506 7.87052 0.805
MachineC 16.00492 4.00061 0.625 0.772
How do I formally test the significance for every single Corr(A,B);
Corr(A,C); Corr(B,C)?
thanks for any help,
René
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