Hi there,I want to start again a discussion about a problem i already had a few years ago:I'm working on a meta-analysis where i combine different designs: independent groups (treatment and control group) on the one hand and only dependent pre post without control group on the other. For both study types I computed hedges' g according to Borenstein et al. (2009).As prescribed for studies that use pre post scores I used the correlation between pre- and post-scores to compute the standard…See More