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within_and_between_group_variance

3 messages · C. AMAL D. GLELE, Ben Bolker

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C. AMAL D. GLELE
# 
Hello, dear all.
Can somebody,  please, tell me:
among the outputs of a glmm and/or glm, what are:
1) within group variance and it's utility
2) between group variance and it's utility
In advance, many thanks.
Best regards,
Ben Bolker
# 
Can we have a little more context for the question please? Utility
for what purpose?

  GLMs (generalized linear models) don't have grouping structure at
all, so the terms "within-group" and "between-group" don't really
apply.

  (G)LMMs summarize "among-group variance" as the variances of the
random effects. "Within-group variance" is the residual variance for a
linear mixed model (LMM, i.e. a GLMM with Gaussian response and
identity link), harder to compute for non-LMM GLMMs (but papers e.g.
by Nakagawa and Schielzeth define these components on the way to
estimating R^2 or intra-class correlation values for GLMMs).
On Tue, Sep 10, 2019 at 11:57 AM C. AMAL D. GLELE <altessedac2 at gmail.com> wrote:
C. AMAL D. GLELE
# 
Thank you so much for your reply.
My question is not about a specific context;
about these terms, I've read somethings that were not clear for me ; so
that, I decide to request the help of the list to know more about them.
Thanks, again.
Best,



Le mar. 10 sept. 2019 ? 16:01, Ben Bolker <bbolker at gmail.com> a ?crit :