Figure 2.

Scatter plots of overall proportion estimates (in percentage) produced by various meta-analysis methods against those by the generalized linear mixed model with the logit link among Cochrane datasets. In each panel, the diagonal dashed line represents the identity line, and Spearman’s rank correlation coefficient ρ between the corresponding two meta-analysis methods is displayed. The two-step method (DAS-H, DAS-G, DAS-A, or DAS-IV) corresponds to the Freeman–Tukey double-arcsine (DAS) transformation, using the harmonic (H), geometric (G), or arithmetic (A) mean of study-specific sample sizes, or using the inverse of the variance (IV) of the synthesized result, as the overall sample size.