[R-sig-eco] R-sig-ecology Digest, Vol 46, Issue 15

[C Hess]

Hi Eric,

the ring widths for each "treatment" (2 species, 2 age groups, 2 soil 
types) are measured from taken cores on 4 sites with 10 individual trees 
within each site.

the continous variables are also measured in a time-series and are the 
same for each site. i have monthly data for temperature (only mean) and 
precipitation. the element input was measured per year.

the temporal span is 25 years.

Best regards
Carsten

P.S.:
Because I am answering the first time to this list I choise the Option 
"Anser to all" and not only "Anser to list".
If the Thunderbird-Option "Anser to list" will do the job I will leave 
it to this next time.

Am 24.01.2012 14:51, schrieb Eric Nord:
> Carsten,
>
> I'm trying to make sure I understand your question. You have taken cores
> (from which you have tree-rings) from 2 species of trees, which are of 2
> ages in 2 different soils - so eight different species*age*soil
> "treatments". You also have climate data and element input data as
> continuous variables.
>
> What is the spatial and temporal resolution of the continuous variables?
> (Are they measured at the level of individual trees, or at the level of
> site? Are they measured in a time-series also, or only for one year?)
>
> Eric Nord, Post Doctoral Scholar
> Department of Horticulture
> The Pennsylvania State University
> 222 Tyson Building, University Park, PA 16802
> 814-863-2313
> ericnord at psu.edu
>
> Get a bicycle. You will not regret it. If you live. - Mark Twain
>
>
>
>
> On Jan 24, 2012, at 6:00 AM, r-sig-ecology-request at r-project.org wrote:
>
> Date: Tue, 24 Jan 2012 11:16:55 +0100
> From: C Hess<13184 at stud.leuphana.de>
> To: r-sig-ecology at r-project.org
> Subject: [R-sig-eco] model for tree-ring analysis
> Message-ID:<4F1E8517.4080603 at stud.leuphana.de>
> Content-Type: text/plain; charset=ISO-8859-15; format=flowed
>
> Dear Listusers,
>
> i had some difficulties in finding a proper model in R for my work in a
> tree-ring analysis. Still working on statistical basics I'am asking here
> for some hints or tipps which will help me on my way to find a model I
> could use in R.
>
> My data sample is a time-series of annual tree-ring widths as the
> response. Explanatory variables are three 2-Level factors
> (species,age,soil) and as continuous variables temperature,
> precipitation and an element input into the ecosystem.
>
> At the end I want to find out, if there is an effect on the tree-ring
> width based on the interaction of the climate-data and the element input.
>
> Best regards
> Carsten
>
>
>
> Eric Nord, Post Doctoral Scholar
> Department of Horticulture
> The Pennsylvania State University
> 222 Tyson Building, University Park, PA 16802
> 814-863-2313
> ericnord at psu.edu
>
> Get a bicycle. You will not regret it. If you live. - Mark Twain
>
> 	[[alternative HTML version deleted]]
>
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