Summary of the Data Sets Treatment Arms Size   Value Parameter ML Estimate treatment 59 Mean 4.9322 4.9322     Variance 9.6850 0.2494 Control 57 Mean 5.5088 5.5088     Variance 10.4330 0.1848   Method Lower CI Upper CI Width   NB 0.6870 1.1036 0.4740 NB* 0.7095 1.1299 0.4653 GEE 0.6987 1.0920 0.4466 GEE* 0.7188 1.1153 0.4393 Ratio 0.6987 1.0920 0.4466 Ratio* 0.7188 1.1153 0.4393

Table 6: Summary statistics, the maximum likelihood estimates of the model parameters, and 95% confidence intervals of the with the confidence widths by the all six methods for MRI vascular lesions data of example 3.