Dear All, I am willing to test homogenity of variances using Levene's test. I know how to do it with simple model, but I am lost when dealing with a little bit more complex model. I have response variable (y) and four factors (a, b, c, d). One of these four 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