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