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...ur factors (d) is nested within another factor (c). In addition, I would like to take into account only 2nd degree interactions in my model. How to do Levene's test in this kind of case? I'll appreciate all advices. With kind regards -Emilia ------------------------------------- Emilia Pippola, research assistant University of Oulu Personal address (NEW!): Rautalammintie 3 B 306 FIN-00550 Helsinki, Finland Mobile: +358-50-5402551 E-mail: epippola at mail.student.oulu.fi

...> model3<-lme(y~(a+b+c)^2, random=~1|d) > anova(model3) I am also willing to test homogenity of variances in this model using Levene's test. How to do it in this kind of case? I'll appreciate all advices. With kind regards -Emilia ------------------------------------- Emilia Pippola, research assistant University of Oulu Personal address (NEW!): Rautalammintie 3 B 306 FIN-00550 Helsinki, Finland Mobile: +358-50-5402551 E-mail: epippola at mail.student.oulu.fi