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Dear all, Greetings! I have one question about correlations. When doing meta-analysis using correlations, can we include both zero-order bivariate correlations and partial correlations? Or one can just use one of them but not mix them together? best...
Dear all, I am confused about how to transform standardized betas to correlation coefficients. Can I used the simple imputation formula proposed by Peterson and Brown (2005) where r = ? + 0.05 ? ? ? is an indicator variable that equals 1 when ? is...
Hi Dr. Wolfgang and all, I am wondering whether one can combine effect sizes from pretest-posttest-control Group designs and effect sizes from pretest-posttest designs(no control group) in a meta-analysis? I know that one should not...
Hi, I am wondering how to calculate effect size for pre-post control design. For example, I have a data: group A: pre mean= 83.91, post mean= 83.24, preSD = 14.9, postSD= 14.88, n= 40; group B...
Thanks a lot! Viechtbauer, Wolfgang (SP) <wolfgang.viechtbauer at maastrichtuniversity.nl>?2021?12?13? ????10:36??? > Dear Yingkai, > > I don't think there is a single answer here. Of course one can do this -- > whether one should in any particular...
Dear Dr. Wolfgang and all, After reading Morris and DeShon, 2002, I have some new questions. Morris provided an example of a meta-analysis based on raw-score and change-score effect sizes (Table 3), however, this is an example...
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