Thank you all for your help. Apologies for not giving an example.
model.matrix was useful as comparing that table with the one from the
spreadsheet showed the "mispell".

On 19/02/2008, Douglas Bates <bates@stat.wisc.edu> wrote:
>
> On Feb 19, 2008 8:41 AM,  <gatemaze@gmail.com> wrote
>
> > on a simple linear model the values produced from the fitted(model)
> function
> > are difference from manually calculating on calc. Will anyone have a
> clue...
> > or any insights on how fitted function calculates the values? Thank you.
>
> ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> As the posting guide (you did read the posting guide, didn't you?)
> says, it helps if you can provide a reproducible example.   Otherwise,
> we can only guess at what you mean.
>
> Try taking a fitted model and examining
>
> model.matrix(model)
>
> and
>
> coef(model)
>
> It should be the case that
>
> model.matrix(model) %*% coef(model)
>
> is reasonably close to fitted(model).
>
> I just saw that Dimitris wrote almost the same thing but, since I have
> written it, I'll mail it anyway.
>



-- 
-- Yianni

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