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The power of marginal score test as a function of regression coefficient of targeting binary risk factor G1 and its correlation ρ with the other risk factor G2. The risk model is assumed as the logistic regression model with the form logit(P(y=1|G1,G2))=α+β1G1+β2G2. The heat map shows the power for a study with 1000 cases and 1000 controls under scenarios where β2=0.1, p1=p2=0.4.
