Figure 1.

The pairs of intracluster correlation and cluster autocorrelation values that are aligned with the intracluster correlation obtained for the Hb1Ac outcome in. One particular set of values is highlighted: ${\rho }_d=0.04$ and $r_d=0.825$ are consistent with ${\hat{\rho }}_e=0.032$ when $T=4$ , $K=430$ and $m=60$ (using equation (10)). This is very close to the pair of values obtained using the approximation in equation (11): ${\rho }_d=0.04$ and $r_d=0.824$ are consistent with ${\hat{\rho }}_e=0.032$ when $T=4$ . This plot also displays the block exchangeable correlation parameters that correspond to the estimated aggregate intracluster correlation.