. Author manuscript; available in PMC: 2013 May 29.

Published in final edited form as: Biometrika. 2006 Dec;93(4):763–775. doi: 10.1093/biomet/93.4.763

Table 2.

Bias and standard error of β̂ using the proposed semi-parametric method and the Sun–Wei estimators when the observation time process depends only on observed covariates

	n=100			n=1000
	Proposed	SW^a	SW^b	Proposed	SW^a	SW^b
Bias	−0·005	0·464	−0·036	−0·003	0·460	−0·040
SE	0·161	0·219	0·191	0·052	0·067	0·059

SW^a, the Sun–Wei estimator of β without modelling the observation pattern; SW^b, the Sun–Wei estimator with modelling the observation pattern; Bias and SE, Monte Carlo sample mean and standard deviation for the 1000 estimates.