. Author manuscript; available in PMC: 2014 Jun 30.

Published in final edited form as: Stat Med. 2012 Dec 12;32(14):2390–2405. doi: 10.1002/sim.5691

Table 2.

WGEE estimates of parameters, standard errors, and type I error rates based on Wald and Score tests, along with empirical standard errors and type I error rates for ZIP under MCAR from 1,000 MC simulations.

Simulation summary for ZIP under missing data following MCAR
β_u₀ = −1, β₀ = 1, β₁ = 1
Parameter	Mean	Standard errors		Type I error for H₀ : β₁ = 1
		GEE	Empirical	Wald		Score
				GEE	Empirical
Sample size of 50
β_u ₀	−1.077	0.378	0.402
β ₀	0.991	0.112	0.120
β ₁	0.997	0.115	0.135
				0.108	0.061	0.046
Sample size of 100
β_u ₀	−1.026	0.257	0.258
β ₀	0.997	0.080	0.082
β ₁	0.998	0.082	0.088
				0.075	0.057	0.044
Sample size of 200
β_u ₀	−1.016	0.180	0.183
β ₀	0.998	0.057	0.055
β ₁	1.000	0.059	0.060
				0.055	0.049	0.045