[R-meta] Determining if an rma.mv model is singular

[Stefanou Revesz]

Michael,

Given the history behind the "sneaky" nature of singular models and
how easily people fall victim to it
(https://arxiv.org/pdf/1506.04967.pdf), I would think it may not be
advisable to simply fit the models and see what happens, indeed
nothing noticeable may happen at times
(https://stats.stackexchange.com/a/449122/140365) and that's probably
why lme4::isSingular() exists.

Stefanou

On Tue, Mar 22, 2022 at 8:25 AM Michael Dewey <lists using dewey.myzen.co.uk> wrote:
>
> Dear Stefanou
>
> Would it not be simplest just to fit the models and see what happens?
> You are not going to break anything.
>
> Michael
>
> On 22/03/2022 00:50, Stefanou Revesz wrote:
> > Dear Wolfgang and list members,
> >
> > Is there any function or code for rma.mv models that would work like
> > lme4::isSingular()?
> >
> > I ask this because, given a fixed number of moderators, I sometimes
> > want to empirically explore how much room for adding random effects in
> > rma.mv I have before my model becomes singular but I don't know how to
> > do that.
> >
> > Thank you so much,
> > Stefanou
> >
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>
> --
> Michael
> http://www.dewey.myzen.co.uk/home.html