Accuracy and precision of fixed and random effects in meta-analyses of randomized control trials for continuous outcomes.
Gnambs Timo, Schroeders Ulrich·Research synthesis methods
Meta-analyses of treatment effects in randomized control trials are often faced with the problem of missing information required to calculate effect sizes and their sampling variances. Particularly, correlations between pre- and posttest scores are frequently not available. As an ad-hoc solution, researchers impute a c…