Topic: Working Correlation Choices

Estimating Unstructured Correlations with Missing Visits

Exchangeable Correlation and Its Validity Bounds

Efficiency Gains Under a Correct Working Correlation

Efficiency Under Working-Correlation Misspecification

Estimating AR(1) Dependence from Residual Pairs

Computational Scaling of Unstructured Correlations

Common Mistakes in Working-Correlation Specification

Cluster Size and Correlation-Parameter Precision

Boundary Estimates and Working-Correlation Failures

Alternating Mean and Correlation Estimation