I am executing a Repeated Measures Analysis of Variance with 1 DV (LOCOMOTOR RESPONSE), 2 Within-Subjects Factors (AGE, ACOUSTIC CONDITION), and 1 Between-Subjects Factor (SEX).
Does anyone know whether the between-subjects factor (SEX) belongs in the Error Term of the aov or not? And if it does belong, where in the Error Term does it go? The 3 possible scenarios are listed below: e.g., 1. Omit Sex from the Error Term: >My.aov = aov(Locomotor.Response~(Age*AcousticCond*Sex) + Error (Subject/(Timepoint*Acx.Cond)), data=locomotor.tab) note: Placing SEX outside the double paretheses of the Error Term has the same statistical outcome effect as omitting it all together from the Error Term (as shown above in #1). 2. Include SEX inside the Error Term (inside Double parentheses): >My.aov = aov(Locomotor.Response~(Age*AcousticCond*Sex) + Error (Subject/(Timepoint*Acx.Cond+Sex)), data=locomotor.tab) 3. Include SEX inside the Error Term (inside Single parentheses): >My.aov = aov(Locomotor.Response~(Age*AcousticCond*Sex) + Error (Subject/(Timepoint*Acx.Cond)+Sex), data=locomotor.tab) note: Placing SEX inside the single parentheses (as shown above in #3) generates no main effect of Sex. Thus, I'm fairly confident that option #3 is incorrect. Scenarios 1,2, and 3 yield different results in the aov summary. Thanks for your help! Alex -- Alexander T Baugh Institute for Neuroscience Univ. of Texas at Austin Austin, TX 78712 512.475.6164 [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.