The Improvement of Testing Methods for Heterogeneity in Meta Analysis

Based on the I2 statistic,which could test the heterogeneity level in Meta-analysis,then the method estimating the heterogeneity level ground on the Q statistic is discussed,the heterogeneous variance τ^2 and H statistic while also provide the corresponding judgement standard.Although the results have indicated that these methods are all equivalent,the method which adopts heterogeneous variance τ^2 to estimate the heterogeneity level is more intuitional and credible.These methods with example to discuss the feasibility and availability are also compared.