Hi. 
Yes I am trying to model such data, and i need R to know that Site is nested
within Habitat. Do I use some kind of command before running the model (like
factor() and so on) or do i write it in the model formula. If so, how?

Thanks



Douglas Bates-2 wrote:
> 
> On Fri, May 29, 2009 at 7:50 AM, DanielWC <daniel.carsten...@gmail.com>
> wrote:
> 
>> Hello
>> I am working with a biological data including variables called Habitat
>> and
>> Site, example:
> 
>> Habitat     Site
> 
>> Forest      Low
>> Forest      Low
>> Forest      High
>> Forest      High
> 
>> I want to tell R that the Site variable is nested within the Forest
>> variable
>> (that it is not a new variable).
>> Does anyone know how to do this?
> 
> If you could explain what you mean by "tell R", it would help.  Are
> you trying to model such data and you want to know how to express the
> relationship between such factors in a model formula?
> 
> ______________________________________________
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> 
> 

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