Figure 7From: An accurate test for homogeneity of odds ratios based on Cochran’s Q-statisticQuality of fit of the gamma approximation. Quality of fit of the gamma approximation (α=8.90 and β=1.66) to the empirical distribution of Q using the data of Stead et al. (2013) with 17 studies, produced by the R package fitdistrplus [30].Back to article page