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4 results for “from:CHAPPELL Francesca”

[R-meta] HSROC hierarchical SROC model in R
CHAPPELL Francesca · Sep 17, 2019 · r-sig-meta-analysis

You can do something similar in R. This is not the Rutter & Gatsonis model, but it does allow for different thresholds and meta-regression. I've not used this, but would be interested to hear how you get on if...

[R-meta] convergence in Mada
CHAPPELL Francesca · Jun 19, 2019 · r-sig-meta-analysis

On a related note, it can also be useful to profile the likelihood of the correlation coefficient - estimation of correlation coefficient can be particularly poor even when convergence is achieved. Francesca -----Original Message----- From: R-sig-meta-analysis [mailto:r...

[R-meta] Power analysis of meta-analysis
CHAPPELL Francesca · Jun 18, 2020 · r-sig-meta-analysis

There is a statistical literature against performing power calculations for existing datasets. Please see https://www.tandfonline.com/doi/pdf/10.1198/000313001300339897?needAccess=true or https://journals.lww.com/annalsofsurgery/Fulltext/2019/01000/Don_t_Calculate_Post_hoc_Power...

[R-meta] Meta-analysis of prevalence data: back-transformation and polytomous data
CHAPPELL Francesca · Feb 24, 2022 · r-sig-meta-analysis

This paper argues for modelling the within-study variance directly as binomial (https://pubmed.ncbi.nlm.nih.gov/18083461/) and provides a SAS program to do so. I think R can do it too with glmer, though I don't...

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