Message-ID: <5377E059.2050800@gmail.com>
Date: 2014-05-17T22:19:05Z
From: Ben Bolker
Subject: fixed effects estimates too small in binomial GLMM with low "success"-rate
In-Reply-To: <5377DD91.9030705@psychologie.uni-freiburg.de>
On 14-05-17 06:07 PM, Henrik Singmann wrote:
> Dear list,
>
> I would really appreciate your input on an issue in which the fixed
> effects estimates of a binomial GLMM with relatively low rate of
> "successes" are too low (compared to the observed effect) by around .5%.
Don't know, but one comment and one thought:
(1) the convergence warning goes away with the most recent version
of lme4 (1.1-7)
(2) I'm _guessing_ that you will find that this phenomenon is
due to Jensen's effect (i.e., a nonlinear averaging effect) --
that would mean its magnitude should be proportional to the
random-effects variances and to the strength of the nonlinear
(inverse link) relationship.
(I think there was a similar, possibly neglected, question along
these lines on the mailing list earlier ...)
Ben Bolker