Hi，everyone
I have some problem when I calculate the mean effect size.
Suppose that the A parameter has ten data from ten articles. How should I synthesize the data and calculate a total effect size value? If the B and C parameters also have ten data from ten articles, how can I calculate the total effect size values of the three parameters A, B, and C simultaneously and display them in one graph?
Thanks very much for your help!
Hi,
Just follow the package guide available on CRAN. I think that your main problem is how your data must bes structred to carry such analysis?
See the attached pics for that.
I recpomile a simple example from metafor package:
#####################
### copy data into 'dat' and examine data dat
One option would be use the esc R-package which is used to calculate the desired effect size first. The functions from this packages return a list with esc class attribute. Using the combine_esc function you can combine each study's calculated effect size into a data.frame . The data.frame is then finally used as argument in the function you plan to use from the metafor package.
A good example to follow this can be found in the blog written by Strenge Jacke :
https://strengejacke.wordpress.com/2016/09/08/effect-size-calculation-for-meta-analysis-in-r-rstats/
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