Fig. 1From: Binomial outcomes in dataset with some clusters of size two: can the dependence of twins be accounted for? A simulation study comparing the reliability of statistical methods based on a dataset of preterm infantsBias of estimates for the variable Birthweight, outcome death. Logistic: ∘, random intercept, PQL: +, random intercept Gauss-Hermite: ♢, GEE: \(\triangledown \) Back to article page