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csize
2010 Apr 03
0
Multilevel model with lme(): Weird degrees of freedom (group level df > # of groups)
Hello everyone,
I am trying to regress applicants' performance in an assessment center
(AC) on their gender (individual level) and the size of the AC (group
level) with a multi-level model:
model.0 <- lme(performance ~ ACsize + gender, random = ~1 | ACNumber,
method = "ML", control = list(opt = "optim"))
I have 1047 applicants in 118 ACs:
> length(performance)
[1] 1047
> length(levels(as.factor(ACNumber)))
[1] 118
There are five AC sizes and gender has two levels (coded as -1 for
fema...