[R-meta] Overlapping CIs with significant difference among subgroups

Rafael Rios b|or@|@e|rm @end|ng |rom gm@||@com
Wed Jun 3 05:27:22 CEST 2020

Dear Dr. Wolfgang,

Thank you very much! Since confidence intervals are not very informative to
exhibit diferences between subgroups, why is this practice so common among
meta-analysts? Why not to present standard errors instead of CIs?

Best wishes,


Em ter, 2 de jun de 2020 às 03:48, Viechtbauer, Wolfgang (SP) <
wolfgang.viechtbauer using maastrichtuniversity.nl> escreveu:

> Dear Rafael,
> CIs can overlap and yet the difference between the two levels can be
> significant. See, for example:
> https://towardsdatascience.com/why-overlapping-confidence-intervals-mean-nothing-about-statistical-significance-48360559900a?gi=b673a691634d
> https://www.psychologicalscience.org/observer/understanding-confidence-intervals-cis-and-effect-size-estimation
> https://blog.minitab.com/blog/real-world-quality-improvement/common-statistical-mistakes-you-should-avoid
> and many more (just google for "test difference overlapping confidence
> intervals" or something along those lines). They don't talk about
> meta-analysis per se, but it's the same principle.
> So, you can trust the test of the difference between the levels of the
> moderators.
> Best,
> Wolfgang
> >-----Original Message-----
> >From: Rafael Rios [mailto:biorafaelrm using gmail.com]
> >Sent: Monday, 01 June, 2020 21:54
> >To: r-sig-meta-analysis using r-project.org; Viechtbauer, Wolfgang (SP)
> >Subject: Overlapping CIs with significant difference among subgroups
> >
> >ATTACHMENT(S) REMOVED: dataset.csv | pruned_super-tree.tre | script.R
> >
> >Dear Wolfgang and All,
> >
> >I conducted a multilevel mixed-effects meta-analysis and found differences
> >between levels of two moderators. I was expecting to find non-overlapped
> >confidence intervals. However, I obtained overlapped confidence intervals
> >for all subgroups. How can I interpret these results? In such situation,
> >should I trust in the Q-test or in the CIs? I controlled for phylogenetic
> >non-independence. Is there a chance of this approach affect the estimation
> >of CIs using predict function? My dataset and script are attached.
> >
> >Best wishes,
> >_______________________________________________________
> >
> >Prof. Dr. Rafael Rios Moura
> >Coordenador de Pesquisa e do NEPEE/CNPq
> >Laboratório de Ecologia e Zoologia (LEZ)
> >UEMG - Unidade Ituiutaba
> >
> >ORCID: http://orcid.org/0000-0002-7911-4734
> >Currículo Lattes: http://lattes.cnpq.br/4264357546465157
> >Research Gate: https://www.researchgate.net/profile/Rafael_Rios_Moura2
> >Rios de Ciência: https://www.youtube.com/channel/UCu2186wIJKji22ai8tvlUfg

*Prof. Dr. Rafael Rios Moura*
Coordenador de Pesquisa e do NEPEE/CNPq
Laboratório de Ecologia e Zoologia (LEZ)
UEMG - Unidade Ituiutaba

ORCID: http://orcid.org/0000-0002-7911-4734
Currículo Lattes: http://lattes.cnpq.br/4264357546465157
<http://lattes.cnpq.br/4264357546465157>Research Gate:
Rios de Ciência: https://www.youtube.com/channel/UCu2186wIJKji22ai8tvlUfg

	[[alternative HTML version deleted]]

More information about the R-sig-meta-analysis mailing list