R help - May 2009 - Nested variables

Hello
Im 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?

Thanks alot

Daniel W. Carstensen
Denmark
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On Fri, May 29, 2009 at 7:50 AM, DanielWC <daniel.carstensen at 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?

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.carstensen at
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?
> 
> ______________________________________________
> R-help at 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.
> 
> 
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