[R-meta] correlation between pre and post test?

[Michael Dewey]

If you are planning to analyse the change scores you will be OK with the 
mean change and its standard error. Otherwise try fitting with a range 
of plausible correlations and see how sensitive the results are to the 
assumed value.

Michael

On 25/08/2021 04:28, YA wrote:
> Dear list,
> 
> 
> I am trying to do meta analysis with random control trial research that has experiment and control group, and pre and post test. According to the meta analysis books, for these kind of research, I need the mean and SD for the experiment and control group at both pre and post test, I also need the correlation between pre and post test. The means and SDs are usually reported by the authors, but the correlations are usually not reported. How do I obtain the correlations between the pre and the post test?
> 
> 
> Thank you very much.
> 
> 
> Best regards,
> 
> 
> YA
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html