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<p>Thanks for your helpful responses! I will quickly add a follow-up
question regarding implementation: Previously (before accounting
for dependencies within studies), my code looked like this:<br>
</p>
<p> res <- rma.mv(yi, dat$V, mods = ~ var1var2 - 1, random
= ~ var1var2 | id, struct="UN", data=dat$dat)</p>
<p>Here, I investigate whether the correlation with a criterion
variable differs between two predictors. Now, I have some studies
with independent samples (different age groups), while I have
other studies with different criterion variables within the same
sample (different measures). If I wanted to introduce both
dependencies, I believe I could change the code as follows:</p>
<p> res <- rma.mv(yi, dat$V, mods = ~ var1var2 - 1, random
= list(~ var1var2 | id, ~sample | id, ~measure | id),
data=dat$dat)</p>
<p>Three concerns: First, is "sample | id" or "id | sample"
appropriate? Second, metafor tells me I can only have to random
factors (<span class="GGHFMYIBGOB ace_constant">"Only up to two '~
inner | outer' formulas allowed in the 'random' argument").
Which should I drop or is there a workaround? Third, I'm
somewhat worrying I might be overfitting. Is this a legit worry?
<br>
</span></p>
<p><span class="GGHFMYIBGOB ace_constant">Best, Anna-Lena<br>
</span></p>
<div class="moz-cite-prefix">Am 13.12.2018 um 16:01 schrieb Guido
Schwarzer:<br>
</div>
<blockquote type="cite"
cite="mid:40b7e18c-2735-dcce-b1ae-eb0a5b7e340f@imbi.uni-freiburg.de">Hi,
<br>
<br>
I got this wrong (and gave a nice answer for a different
question).
<br>
<br>
See Wolfgang's email for the correct answer.
<br>
<br>
Best wishes, Guido
<br>
<br>
</blockquote>
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<h3 class="auto-style2">Dr. Anna-Lena Schubert</h3>
<p style="line-height: 1;"><img
src="cid:part1.7ED96202.F1B132C8@psychologie.uni-heidelberg.de"
data-filename="Logo_Diff.png" style="width: 215.5px; float:
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class="auto-style1"><span class="auto-style4">Postdoc at
Section of Personality</span><br class="auto-style4">
<span class="auto-style4">Heidelberg University - Institute
of Psychology</span></span></font></p>
<pre style="line-height: 1;">Hauptstraße 47-51
<span style="line-height: 1;">D-69117 Heidelberg
</span><span style="line-height: 1;">Germany</span></pre>
<pre style="line-height: 1;">Phone: +49 6221 54 7746
Mail: <a class="moz-txt-link-abbreviated" href="mailto:anna-lena.schubert@psychologie.uni-heidelberg.de">anna-lena.schubert@psychologie.uni-heidelberg.de</a>
Web: <a class="moz-txt-link-freetext" href="http://www.psychologie.uni-heidelberg.de/ae/diff/diff/people-schubert.html">http://www.psychologie.uni-heidelberg.de/ae/diff/diff/people-schubert.html</a></pre>
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