Hi,

I just found out type III ANOVA won't give me model comparison result, 
am I not suppose to do model comparison with type III ANOVA?

Say we have two models
m1=lm(data~factor1+factor2,data=table)
m2=lm(data~factor1*factor2,data=table)

Type I ANOVA comparison
anv1=anova(m1,m2)

Type III ANOVA Comparison, from car package
anv2=Anova(m1,m2,type="III")

anv1 give me correct result
anv2's result similar to Anova(m1, type="III")

Can anyone please explain why?

Thanks,
Yonggan

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