Fig. 3From: Common sampling and modeling approaches to analyzing readmission risk that ignore clustering produce misleading resultsCorrelation measures of models tested in validation samples of adult patients with diabetes. The x-axis shows the size of the initial cohort from which training and validation samples were drawn. Boston, Massachusetts, 2004–2012. GEE = generalized estimating equations. CWGEE = cluster-weighted generalized estimating equationsBack to article page