is residual deviance liq what is the significance of residual deviance what is overdispersion of residual deviance if the residual deviance ratio is 1.9, is it overdispersed is glm overdispersion significant what is a reasonable cutoff value for glm overdispersion what is the pchisq test on r if residual deviance is negative is it important? what is the value for glm overdispersion is glm overdispersion a statistic if df is significant what ratio is used? when can a glm be overdispersed? what is the test for overdispersion if overdispersion is positive, how is it test is df a glm glm overdispersion definition what is the test for overdispersion of glm? when do glm overdisperse what is glm overdispersion test how to measure overdispersion of a glm