[R-meta] Spatial-temporal meta-analysis

Rafael Rios biorafaelrm at gmail.com
Sun Nov 12 18:08:44 CET 2017

Dear Wolfgang,

Thank you for the attention. My data set follows on attached (CSV file).
When we found more than one season (three, for instance), we wrote "3" in
the "season" column. Follow, we identified seasons as "1", "2" and "3" in
the "class_season" column corresponding to each effect size. When there was
only one season, we wrote "1" in the season column and "0" in the
class_season column. We adopted the same procedure for the "pop" and
"pop_class" columns corresponding to data about one or more populations. We
also used as random variables "study" and "species". How may I do a random
effects model to evaluate if variation in average effect size is greater
than zero?


Rafael R. Moura.
*scientia amabilis*

Doutorando da Pós-graduação em Ecologia e Conservação de Recursos Naturais
Universidade Federal de Uberlândia, Uberlândia, MG, Brasil

ORCID: http://orcid.org/0000-0002-7911-4734
Currículo Lattes:
Research Gate: https://www.researchgate.net/profile/Rafael_Rios_Moura2


2017-11-11 11:15 GMT-02:00 Viechtbauer Wolfgang (SP) <
wolfgang.viechtbauer at maastrichtuniversity.nl>:

> Dear Rafael,
> What exactly do you mean by 'temporal categories'? It might also help to
> show (part of) your data to clarify what your data really look like.
> Best,
> Wolfgang
> >-----Original Message-----
> >From: Rafael Rios [mailto:biorafaelrm at gmail.com]
> >Sent: Friday, 10 November, 2017 13:37
> >To: Viechtbauer Wolfgang (SP)
> >Cc: r-sig-meta-analysis at r-project.org; Michael Dewey
> >Subject: RE: Spatial-temporal meta-analysis
> >
> >Dear Wolfgang,
> >
> >Thank you for the reply. I am sorry to complicate something that should
> >be simple. I want to evaluate if the effect size vary throughout the
> >time, for example. Therefore, I thought to use a measure that estimate
> >such temporal variation in effect size, like CV. I did not consider to
> >use temporal categories as a moderator because I have different
> >categories for each species. For instance, I have three effect sizes for
> >three breeding seasons in a species, while I have twelve measures for
> >another species. Even in this situation, may I use temporal categories in
> >the function rma.mv? If I can do this, it will be amazing.
> >
> >Best wishes,
> >
> >Rafael.
> >
> >Em 10 de nov de 2017 8:45 AM, "Viechtbauer Wolfgang (SP)"
> ><wolfgang.viechtbauer at maastrichtuniversity.nl> escreveu:
> >Dear Rafael,
> >
> >It is still not really clear to me what want to do. You say that you want
> >to "use coefficient of variance (CV) and number of replicates in rma.mv
> >function of metafor package to built a random model controlling
> >phylogenetic signal". I have no idea what that means, so I cannot say if
> >this approach is appropriate or not.
> >
> >When you say that you want to examine if effect sizes vary in space and
> >time, then why not include some measure of time and some measure of
> >location in the model as predictors/moderators?
> >
> >Best,
> >Wolfgang
> >
> >>-----Original Message-----
> >>From: Rafael Rios [mailto:biorafaelrm at gmail.com]
> >>Sent: Thursday, 09 November, 2017 14:51
> >>To: Viechtbauer Wolfgang (SP); r-sig-meta-analysis at r-project.org;
> >Michael
> >>Dewey
> >>Subject: Spatial-temporal meta-analysis
> >>
> >>Dear Wolfgang and All,
> >>
> >>I am still working on an approach to evaluate variations in effect sizes
> >>in space and time. I have several replicates of effect sizes (Fisher's
> >Z)
> >>in different populations and/or breeding seasons for each species. My
> >>hypothesis is that effect size varies in space and time. Then, I want to
> >>use a random model to evaluate if a estimative of variation in effect
> >>size is high when compared to a null model. I am wondering if I can use
> >>coefficient of variance (CV) and number of replicates in rma.mv function
> >>of metafor package to built a random model controlling phylogenetic
> >>signal. Do you agree with my approach or suggest to use another measure
> >>of variation in replicates of effect size or a different estimate of
> >>weight?
> >>
> >>Best wishes,
> >>
> >>Rafael R. Moura.
> >>scientia amabilis
> >>
> >>Doutorando da Pós-graduação em Ecologia e Conservação de Recursos
> >>Naturais
> >>Universidade Federal de Uberlândia, Uberlândia, MG, Brasil
> >>
> >>ORCID: http://orcid.org/0000-0002-7911-4734
> >>Currículo
> >>Lattes: http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4244
> >9
> >>08A8
> >>Research Gate: https://www.researchgate.net/profile/Rafael_Rios_Moura2
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