Fig. 7From: On the Q statistic with constant weights in meta-analysis of binary outcomesEmpirical level at nominal level of significance .05, vs \(\Delta\), for four approximations to the null distribution of \(Q_F\) for risk difference and for two approximations to the null distribution of \(Q_{IV}\), when \(p_{iC} = .1\). First two rows: equal sample sizes \(n = 40\) and 100; second two rows: unequal sample sizes, \(\bar{n} = 30\) and 100Back to article page