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

[Mike Cheung]

Dear YA,

If the authors have not reported the correlation, you may have to impute it
or delete that study. Riley et al. (2008) proposed a model combining the
between- and within-correlation.

Riley, R. D., Thompson, J. R., & Abrams, K. R. (2008). An alternative model
for bivariate random-effects meta-analysis when the within-study
correlations are unknown. Biostatistics, 9(1), 172–186.
https://doi.org/10.1093/biostatistics/kxm023

Best,
Mike

On Wed, Aug 25, 2021 at 11:29 AM YA <xinxi813 using 126.com> 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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