Re: [R] zero random effect sizes with binomial lmer

From: Gregor Gorjanc <gregor.gorjanc_at_bfro.uni-lj.si>
Date: Sun 31 Dec 2006 - 12:55:44 GMT

Daniel Ezra Johnson <johnson4 <at> babel.ling.upenn.edu> writes: ...
> If one compares the random effect estimates, in fact, one sees that
> they are in the correct proportion, with the expected signs. They are
> just approximately eight orders of magnitude too small. Is this a bug?
...

BLUPs are essentially shrinkage estimates, where shrinkage is determined with magnitude of variance. Lower variance more shrinkage towards the mean - zero in this case. So this is not a bug.

Gregor



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