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3 results for “from:Ana Benítez”

[R-meta] Variance-covariance is not positive definite.
Ana Benítez · Sep 19, 2019 · r-sig-meta-analysis

Dear Wolfgang and meta-analysis list subscribers, I am running a muti-level meta-regression in which I have several comparisons using a common control for some of the studies. My effect size is the log response ratio (RR) and...

[R-meta] Variance-covariance is not positive definite.
Ana Benítez · Sep 26, 2019 · r-sig-meta-analysis

Dear Wolfgang, Apologies for sending the text in rich-text format. Here I copy-paste the original message and I additionally attach a piece of code to solve the issue. I got the code from Alfredo S?nchez-Tojar but...

[R-meta] meta-analysis of response ratios with low sample sizes
Ana Benitez · Jan 18, 2019 · r-sig-meta-analysis

Dear Wolfgang (and users of the meta-analysis mailing list), I am currently conducting a meta-analisis where I want to assess body size shifts in vertebrates living in islands compared to mainland populations (a.k.a the island rule...

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