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. Author manuscript; available in PMC: 2010 Oct 12.

Published in final edited form as: Stat Med. 2009 May 15;28(11):1620–1635. doi: 10.1002/sim.3563

Table DIII.

Bias and MSE for estimated parameters with unequal sample sizes.

Method	Bias			MSE
Method	β₀	β₁	β₂	β₀	β₁	β₂
Total sample size N =(100+200+500+1200+3000) × 3 = 15000
Weighted mean	0.0196	0.0049	−0.0056	0.5540	0.0251	0.0496
Mean	−0.0231	0.0067	−0.0076	0.8445	0.0567	0.0875
Median	0.0208	0.0073	−0.0082	0.6676	0.0680	0.0329
Minimum	−0.0538	0.0211	−0.0103	3.0387	0.0733	0.1526
Maximum	−0.0236	0.0040	−0.0123	5.8060	0.1549	0.2748
Total sample size N = (10+20+50+120+300) × 3 = 1500
Weighted mean	0.1147	0.0268	−0.0283	3.0217	0.3488	0.3621
Mean	0.2007	0.0234	0.0322	4.4266	0.3396	0.4212
Median	0.1583	0.0283	−0.0379	7.2861	0.4095	0.3714
Minimum	−2.8130	−0.4905	0.6229	73.6571	2.0423	3.8998
Maximum	−0.5346	0.1130	0.0830	529.7432	96.6978	61.0214