Table 2. Monte Carlo Relative Efficiency of Locally Efficient Augmented GEE to Suboptimal Augmented GEE.
Continuous longitudinal outcomes. Working Marginal Covariance (WMCov): 1) True, exchangeable for V(E(Y|X,A)|A) and AR1 for V(Y|X,A) 2) AR1 for V(Y—A). Outcome Regression (OR): Correct (C), Model 1(M1), Model 2 (M2). First entry α = 0.1, second entry α = 0.3, third entry α = 0.5.
| Correlation between Y and X | ||||||
|---|---|---|---|---|---|---|
|
| ||||||
| WMCov/OR | 10 | 20 | 30 | 40 | 50 | 60 |
| True/C | 1.0281 | 1.0700 | 1.1168 | 1.1662 | 1.2175 | 1.2702 |
| 1.0166 | 1.0425 | 1.0728 | 1.1055 | 1.1398 | 1.1752 | |
| 1.0090 | 1.0234 | 1.0409 | 1.0603 | 1.0811 | 1.1028 | |
| True/M1 | 0.9995 | 0.9929 | 0.9851 | 0.9783 | 0.9735 | 0.9717 |
| 1.0006 | 0.9974 | 0.9930 | 0.9887 | 0.9854 | 0.9837 | |
| 1.0009 | 0.9999 | 0.9982 | 0.9961 | 0.9943 | 0.9931 | |
| True/M2 | 1.0284 | 1.0703 | 1.1171 | 1.1664 | 1.2176 | 1.2701 |
| 1.0168 | 1.0428 | 1.0731 | 1.1058 | 1.1401 | 1.1754 | |
| 1.0092 | 1.0237 | 1.0412 | 1.0606 | 1.0814 | 1.1031 | |
| AR1/M1 | 0.9916 | 0.9645 | 0.9300 | 0.8902 | 0.8832 | 0.8887 |
| 0.9972 | 0.9858 | 0.9707 | 0.9567 | 0.9481 | 0.9481 | |
| 0.9996 | 0.9958 | 0.9903 | 0.9849 | 0.9811 | 0.9802 | |