Figure 1.

Mean difference: Bias of estimators of between‐studies variance τ ²∈[0,0.1] (top two rows) and τ ²∈[0,1] (bottom two rows) for μ=0, q=0.75 when ${\sigma }_C^2=1$, ${\sigma }_T^2=2$, n=20,40, and K=5,10,30. Light gray line at 0. CDL, corrected DL; DL, DerSimonian‐Laird; J, Jackson; MP, Mandel‐Paule; REML, restricted maximum‐likelihood; WT, Welch‐type [Colour figure can be viewed at http://wileyonlinelibrary.com]