[R-meta] Removing the intercept in rma.mv after non-significant QM/F test

Michael Dewey ||@t@ @end|ng |rom dewey@myzen@co@uk
Thu Dec 9 16:59:16 CET 2021

Dear Tina

When you leave the intercept in you are testing whether the two levels 
differ. When you take it out you are separately testing for each whether 
its coefficient differs from zero. Those are clearly not the same.


On 09/12/2021 12:32, T D wrote:
> Dear all,
> I have a question regarding the rma.mv function.
> Some QM tests (test of moderation) are not significant. However, I continued to investigate both levels of the moderator regardless by removing the intercept (i.e with placing a -1 at the end)
> How sensible is this and what kind of conclusions can I draw when both levels (after removing the intercept) produce significant results. I understand I can’t draw any overall conclusions for the a priori hypotheses, considering the test of moderation was not significant - but generally, I wonder, whether it is “ok” to report this - or whether it is simply wrong to continue with any analysis if the QM test is not significant.
> Many thanks for clarifying.
> Kind regards,
> Tina Dudenhöffer
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