[R-meta] r-sig-meta-analysis: metafor with

[Michael Dewey]

Dear Guillem

Opinions will doubtless differ over this one but my view, for what it is 
worth, is that if you consider there is an underlying latent variable of 
anthropogenic pressure and the proxies are all (imperfect) measures of 
that latent variable then I would proceed. I would include 
correlation_with as a moderator though whether it reaches some arbitrary 
level of statistical significance or not.

Michael

PS before you post again can you register so we do not have to manually 
authorise your post please.

On 01/03/2019 11:22, Guillem Chust wrote:
> Dear Dr Viechtbauer,
> 
> 
> 
> I would like to apply metafor for conducting a meta-analysis in the following case, but I'm not sure wether this is correct or not.
> 
> We have compiled studies on the correlation r between an index of water quality and anthropogenic pressures (see some examples below).
> 
> The water quality index is always the same, but the pressure has been measured using different proxies: e.g ammonium, Cadmium, oxygen,...
> 
> Can in this case apply a metanalysis? Or the metanalysis should be applied only with studies conducted with the same two variable pairs?
> 
> 
> 
> Study  N  r  correlation_with
> 
> Mulik et al. (2017)  12 0.69  ammonium
> 
> Carvalho et al. (2006)  24 0.78  As
> 
> Santiba�ez et al (2018) 27 0.86  Ba
> 
> Borja et al. (2006)  120   0.45  Cd
> 
> Borja et al. (2006)  120   0.47  Cr
> 
> Carvalho et al. (2006)  24 0.83  Cr
> 
> Spagnolo et al. (2014)  12 0.605 Cr
> 
> Borja et al. (2006)  120   0.29  Cu
> 
> 
> 
> Sincerely,
> 
> Guillem Chust, PhD
> AZTI - Marine Research Division
> Txatxarramendi ugartea z/g; 48395 Sukarrieta (SPAIN)
> Tel: (+34) 667174396
> www.azti.es
> 
> 
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> 
> 
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html