[R] Three-way ANOVA?

From: <e.rapsomaniki_at_mail.cryst.bbk.ac.uk>
Date: Sat 31 Jul 2004 - 06:01:56 EST

Hi,

I'm a biologist, so please forgive me if my question sounds absurd! I have 3 parameters x1, x2, x3 and a response variable y.The sample size is 75. I tried to do the following:
mylm<-lm(y~ x1 + x2 + x3, data="mydata")

but i can only get stats from anova for the first 2 variables. The third comes up as NA. The degrees of freedom for the third variable are 0.

Is there something else i could do to fit a model that contains all these three variables?

Many Thanks
Eleni



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