Figure 2.

Box plots representing the distribution of meta‐analytic estimates calculated from four combinations of analytical methods (all SAFV, all SACS, all ANCOVA and Rand. select.) using a fixed effect model. Box plots represent simulation scenarios with θ = 0, ${\sigma }_{Y_{int}}^2=1$ and τ ² = 0. Separate plots represent different correlations. Note that outliers are not plotted. SAFV, simple analysis of final values; ANCOVA, analysis of covariance; SACS, simple analysis of change scores; Rand. select., random selection