[R-meta] Spatial-temporal meta-analysis
Rafael Rios
biorafaelrm at gmail.com
Mon Nov 13 15:25:47 CET 2017
Dear Michael,
Thank you for the reply and assistence. I want to evaluate potential
spatio-temporal variation in effect size. Thus, I may built a random
effects meta-analysis to test if effect size changes (or it is consistent)
in space and time. I am having difficulty to choose an appropriate approach
to reach this goal.
Abraço,
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=K4244908A8
Research Gate: https://www.researchgate.net/profile/Rafael_Rios_Moura2
<http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4244908A8>
2017-11-13 7:46 GMT-02:00 Michael Dewey <lists at dewey.myzen.co.uk>:
> Dear Rafael
>
> It might help to have just a sentence or two about the scientific question
> here as I (and perhaps others) am not quite clear what your phrase
> "variation in average effect size is greater than zero" means.
>
> Michael
>
> On 12/11/2017 17:08, Rafael Rios wrote:
>
>> 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?
>>
>> Abraço,
>>
>> 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/bu
>> scatextual/visualizacv.do?id=K4244908A8
>> Research Gate: https://www.researchgate.net/profile/Rafael_Rios_Moura2
>>
>>
>> <http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4244908A8>
>>
>> 2017-11-11 11:15 GMT-02:00 Viechtbauer Wolfgang (SP) <
>> wolfgang.viechtbauer at maastrichtuniversity.nl <mailto:
>> 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 <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
>> <mailto: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 <http://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
>> <mailto: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 <http://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
>> <mailto:biorafaelrm at gmail.com>]
>> >>Sent: Thursday, 09 November, 2017 14:51
>> >>To: Viechtbauer Wolfgang (SP); r-sig-meta-analysis at r-project.org
>> <mailto: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
>> <http://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
>> <http://orcid.org/0000-0002-7911-4734>
>> >>Currículo
>> >>Lattes:
>> http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4244
>> <http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4244>
>> >9
>> >>08A8
>> >>Research Gate:
>> https://www.researchgate.net/profile/Rafael_Rios_Moura2
>> <https://www.researchgate.net/profile/Rafael_Rios_Moura2>
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>>
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> --
> Michael
> http://www.dewey.myzen.co.uk/home.html
>
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