Does Jamovi use Cohen's d as standardized mean difference?
Does Jamovi use Cohen's d as standardized mean difference?
I have been using Jamovi version 1.6.23 for meta-analysis, with a random-effects model fitted to the data, and using the standardized mean difference (SMD) as the outcome measure. Does anyone know if the SMD that Jamovi provides is exactly Cohen’s d? or is the SMD given by Jamovi calculated with a different formula (different from Cohen's d)?
Re: Does Jamovi use Cohen's d as standardized mean differenc
is this for the MAJOR module? it's helpful if you mention the module you're using.
i'm not actually sure what the SMD is.
cheers
jonathon
i'm not actually sure what the SMD is.
cheers
jonathon
Re: Does Jamovi use Cohen's d as standardized mean differenc
Yes, this would be for the MAJOR module. I don't know what estimator is used for the calculation of the standardized mean difference (SMD) in this module. SMDs are usually estimated by Cohen's d or Hedges' g. I was wondering if someone knew how SMDs are estimated in the MAJOR module of Jamovi.
Cheers,
Francisco
Cheers,
Francisco
Re: Does Jamovi use Cohen's d as standardized mean differenc
Hey Francisco,frbp wrote: Does anyone know if the SMD that Jamovi provides is exactly Cohen’s d? or is the SMD given by Jamovi calculated with a different formula (different from Cohen's d)?
Standardized Mean Difference (SMD) was one of the first effect dimensions used in published meta-analyzes (Larry V. Hedges & Olkin 1985) and remains widely used.
There are many ways to calculate the SMD for a data set.
In jamovi the MAJOR module imports/uses Wolfgang Viechtbau's metafor R package.
It's called Hedge's g (Hedges, 1981), in the metafor package, the default value for SMD.
Cheers, Maurizio
Re: Does Jamovi use Cohen's d as standardized mean differenc
Hi Maurizio,
Thank you very much for the clarification.
Cheers,
Francisco
Thank you very much for the clarification.
Cheers,
Francisco