Fig. 2From: 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 O 2 dependence at 36 weeks. Logistic: ∘, random intercept, PQL: +, random intercept Gauss-Hermite: ♢, GEE: \(\triangledown \) Back to article page