search for: restmodel

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2009 Feb 27
1
testing two-factor anova effects using model comparison approach with lm() and anova()
...h to analysis of variance by using anova() to compare a full model that contains all effects, to restricted models that contain all effects save for the effect of interest. The test of the interaction effect seems to be as I expected: > fullmodel<-lm(DV~factorA+factorB+factorA:factorB) > restmodel<-lm(DV~factorA+factorB) > anova(fullmodel,restmodel) Analysis of Variance Table Model 1: DV ~ factorA + factorB + factorA:factorB Model 2: DV ~ factorA + factorB Res.Df RSS Df Sum of Sq F Pr(>F) 1 24 18.0000 2 26 27.8667 -2 -9.8667 6.5778 0.005275 ** As you can see...