[R-sig-ME] var(ranef(Random Effect)) not the same as the variance component

D. Rizopoulos d@r|zopou|o@ @end|ng |rom er@@mu@mc@n|
Tue Sep 8 05:02:13 CEST 2020

Yes, you do not expect these two be the same. The variance components are the prior variances of the random effects, whereas var(ranef(model)) is the variance of the posterior means/modes of the random effects.


Dimitris Rizopoulos
Professor of Biostatistics
Erasmus University Medical Center
The Netherlands
From: R-sig-mixed-models <r-sig-mixed-models-bounces using r-project.org> on behalf of Simon Harmel <sim.harmel using gmail.com>
Sent: Tuesday, September 8, 2020 1:22:15 AM
To: r-sig-mixed-models <r-sig-mixed-models using r-project.org>
Subject: [R-sig-ME] var(ranef(Random Effect)) not the same as the variance component

Hello All,

A very basic question. Generally, `var(ranef(Random Effect))` may not
necessarily be the same as the variance component reported for that Random
Effect in the model output, correct?

Thank you all,

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