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

[YA]

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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