[R] Factors attribute?

[Henrique Dallazuanna]

See ?terms

On Mon, Mar 22, 2010 at 2:08 PM,  <rkevinburton at charter.net> wrote:
> I noticed that when I fit a linear model using 'lm' there is an attribute called "factors" that is added to the "term". It doesn't seem to appear for 'model.matrix', just 'lm'. I have been unable to find where it gets constructed or what it means? It looks like a two dimensional array that I may be able to use so I would just like to get some 'official' statement regarding what it is and how it is constructed. I would rather not go on my assumptions. An example would be like:
>
>> l <- lm(prestige ~ income + education, data=Duncan)
>> attr(l$terms,"factors")
>          income education
> prestige       0         0
> income         1         0
> education      0         1
>
> Thank you.
>
> Kevin Burton
> rkevinburton at charter.net
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O