Message-ID: <CAFUVuJzkAHnszaH_-15LnRs=4ubyoYXRtyq8GbUBeWc4knyZgA@mail.gmail.com>
Date: 2020-12-09T18:20:14Z
From: James Pustejovsky
Subject: [R-meta] Egger's test with multilevel meta analysis
In-Reply-To: <97e1e643-ccdc-4707-8d07-5baaccbb070a@email.android.com>
We have a paper (forthcoming in Psych Methods) evaluating a similar method
for adapting Egger's test to the multilevel context, using RVE:
* Rodgers, M. A., & Pustejovsky, J. E. (In Press). Evaluating Meta-Analytic
Methods to Detect Selective Reporting in the Presence of Dependent Effect
Sizes. Psychological Methods, forthcoming.
https://doi.org/10.31222/osf.io/vqp8u
There is also a related paper by Fernandez-Castilla and colleagues:
* Fern?ndez-Castilla, B., Declercq, L., Jamshidi, L., Beretvas, S. N.,
Onghena, P., & Van den Noortgate, W. (2019). Detecting selection bias in
meta-analyses with multipleoutcomes: A simulation study. The Journal of
Experimental Education, 1?20.
These tests can be implemented in rma.mv() simply by including the standard
error of the effect size (or a related measure of precision, such as the
sample size) as a moderator. Say that data includes a variable called sei
for the standard error of each effect size:
egger_multi <- rma.mv(yi = yi, V = sei^2, random = ~ 1 | studyID, effectID,
mods = ~ sei, data = dat)
Then apply cluster-robust standard errors for the RVE-based test:
coef_test(egger_multi, vcov = "CR2")
Further details available in our paper, and example code in our
supplementary materials.
James
On Wed, Dec 9, 2020 at 12:07 PM <t.saueressig at gmx.de> wrote:
> Hi Dylan,
>
> you might want to look at this
> https://onlinelibrary.wiley.com/doi/abs/10.1111/biom.13342
>
> And this
>
> https://cran.r-project.org/web/packages/xmeta/
>
> Regards
>
> Tobias
>
>
>
> Am 09.12.2020 18:54 schrieb Dylan Johnson <dylanr.johnson at mail.utoronto.ca
> >:
>
> Hello,
>
> I am in the process of carrying out a multilevel meta analysis using ?
> rma.mv?. Unfortunately, it does not seem like this type of model can be
> used with the dmetar ?eggers.test? function.
>
> Does anyone have any suggestions for how I could get around this?
>
> Many thanks!
>
> Dylan
>
>
>
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>
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