Correlation Coefficients for a Meta-analysis

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maymay
Posts: 5
Joined: Tue Jan 03, 2023 6:45 pm

Correlation Coefficients for a Meta-analysis

Post by maymay »

Hi,
I use the option of Correlation Coefficients for a Meta-analysis.
Unfortunately, I noticed that the z confidence intervals in the forest plot are a little different from what I get by manual calculation.
I use Model measures: Fisher's r-to-z option to get the z.

I was wondering is the formula that the software use different from the one I know.
The formula I use is:

[1/(n-3)]^0.5= SE
minZ = r-1.96SE
maxZ = r+1.96SE

Thank you
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MAgojam
Posts: 421
Joined: Thu Jun 08, 2017 2:33 pm
Location: Parma (Italy)

Re: Correlation Coefficients for a Meta-analysis

Post by MAgojam »

Hey @maymay,
yes the formula is slightly different than yours, but I think the attached screenshot is self-explanatory and satisfies your question.
MAJOR_correlation_coefficient.png
MAJOR_correlation_coefficient.png (267.85 KiB) Viewed 1296 times
Cheers,
Maurizio
maymay
Posts: 5
Joined: Tue Jan 03, 2023 6:45 pm

Re: Correlation Coefficients for a Meta-analysis

Post by maymay »

Hey Maurizio,
Thank you very much!!
Can you please let me know how can I see this code for next time?
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MAgojam
Posts: 421
Joined: Thu Jun 08, 2017 2:33 pm
Location: Parma (Italy)

Re: Correlation Coefficients for a Meta-analysis

Post by MAgojam »

maymay wrote: Wed Jan 04, 2023 7:35 pm Can you please let me know how can I see this code for next time?
Hey @maymay,
the R code at the bottom right is not possible in MAJOR, but I put it (RStudio console) as a step of the calculation to get the confidence intervals provided by the module.
But I am attaching the jamovi file, where with a few lines of R code in Rj editor+, 4 new variables related to rtoz, se, cil and ciu can be saved in the data sheet of the file for a comparison with the forest plot values.
If you want, you can try on your data, simply replacing the name rho in data$rho and n in data$n with that of your variables for correlations and sample size.
MAJOR_correlation_coefficient.omv
(86.86 KiB) Downloaded 87 times
Cheers,
Maurizio
maymay
Posts: 5
Joined: Tue Jan 03, 2023 6:45 pm

Re: Correlation Coefficients for a Meta-analysis

Post by maymay »

Thank you very much
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