k.
>
> ?contrasts ## what else!
> ?C
>
> for details.
>
> Beyond this, I cannot help.
>
> -- Bert
>
> Bert Gunter
>
> "Data is not information. Information is not knowledge. And knowledge
> is certainly not wisdom."
>-- Clifford Stoll
>
>
Hi Bert,
I apologize for the HTML. I will pay more attention in the future.
I know that the lm() command of my toy example fits the wrong model
with a singular design, maybe I shouldn't have included it.
I believe that the model with the additional constraint(s) is not
garbage. But I don't know
wrong model, using two constraints (with the
"contr.sum" specification), \sum_{i=1}^m \alpha_i = 0 and \sum_{j=1}^{n}
\beta_{j} = 0, and resulting in a singular design matrix.
Is there a way to specify the right constraints in lm?
Thanks in advance for any help,
davide
--
Davide
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