[R-meta] Sigma in Bayesian Multi-Level Meta-Analytic Models (brms)

Hanna Mütze muetzeh @end|ng |rom un|-bremen@de
Thu Jan 9 11:18:57 CET 2025


Dear all,

I conducted a Bayesian 3-level meta-analysis with |brms| and noticed 
that σ is consistently estimated as 0, even in 2-level and 4-level 
models. I observed the same behavior in this tutorial: 
https://mvuorre.github.io/posts/2016-09-29-bayesian-meta-analysis/#ref-mcelreathStatisticalRethinkingBayesian2020. 
How should I interpret this result?

How should I interpret this result? Am I correct in assuming that 
Bayesian models do not estimate the sampling error because it is assumed 
to be known based on the sample size? Unfortunately, I could not find 
references supporting this interpretation and would appreciate any 
clarification or guidance.

Thank you for your time and help!

Best regards,
Hanna Mütze

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