[R-meta] correct tau interpretation three-level meta-analysis

[Filippo Gambarota]

Hi,
I'm conducting a meta-analysis using a three-level model because I
have multiple effects within the same study. My model is something
like this:

```
rma.mv(yi, vi, random = ~1|study/outcome)
```
My question is simply how to correctly interpret tau at the outcome
level. The tau at the study level is basically the standard
heterogeneity. The tau at the outcome level is the average variability
within a cluster (study)?
Thanks

-- 
Filippo Gambarota
PhD Student - University of Padova
Department of Developmental and Social Psychology
Website: filippogambarota.netlify.app
Research Group: Colab   Psicostat