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Standardized mean difference: Bias of the estimators of δ and ratio of mean squared errors (MSEs) of SSW to inverse‐variance‐weighted estimators when δ=1, q=.5, n=20,40, and K=5,10,30. Light gray line at 0 for bias and at 1 for the ratio of MSEs. DL, DerSimonian‐Laird; KDB, Kulinskaya‐Dollinger‐Bjørkestøl; J, Jackson; MP, Mandel‐Paule; REML, restricted maximum‐likelihood [Colour figure can be viewed at http://wileyonlinelibrary.com]
