Re: [R] Ancova doesn't return test statistics

2007-11-15 Thread Gustaf Rydevik
On Nov 15, 2007 4:36 PM, Johan A. Stenberg <[EMAIL PROTECTED]> wrote: > Dear all, > > I'm quite sure that this is a stupid question, but I'll ask anyway. > I want to perform an ANCOVA with two continuous factors and three > categorical factors. > > Plant population growth rate (GR) = dependent vari

Re: [R] Ancova doesn't return test statistics

2007-11-15 Thread Richard M. Heiberger
Your model is fully saturated. It specifies terms that use up all degrees of freedom. There are no degrees of freedom left over for a Residual term and therefore there is no denominator for the tests. When you drop one term, then those degrees of freedom are left over, that is they form the Res

Re: [R] Ancova doesn't return test statistics

2007-11-15 Thread Marc Schwartz
On Thu, 2007-11-15 at 16:36 +0100, Johan A. Stenberg wrote: > Dear all, > > I'm quite sure that this is a stupid question, but I'll ask anyway. > I want to perform an ANCOVA with two continuous factors and three > categorical factors. > > Plant population growth rate (GR) = dependent variable >

[R] Ancova doesn't return test statistics

2007-11-15 Thread Johan A. Stenberg
Dear all, I'm quite sure that this is a stupid question, but I'll ask anyway. I want to perform an ANCOVA with two continuous factors and three categorical factors. Plant population growth rate (GR) = dependent variable Seed reduction due to herbivory (SR) = continuous explanatory variable Herbi