Table 3.

Weighted and centered estimator of the proximal effect, β̂₁, with different working correlation structures.

Working Correlation	Mean	SD	RMSE	CP
Independent (i)	−0.20	0.07	0.07	0.96
AR(1) (ii)	−0.13	0.06	0.09	0.66

RMSE, root mean squared error and SD, standard deviation of β̂₁; CP, 95% confidence interval coverage probability for ${\beta }_1^{\ast }=-0.2$. Results are based on 1000 replicates with n = T = 30. Boldface indicates whether Mean or CP are significantly different, at the 5% level, from −0.2 or 0.95, respectively.