Re: [R] RDA Triplot

2010-11-29 Thread Danielwc

Since I am doing an RDA with contraints I get this error message when trying
to use biplot.rda:

'biplot.rda' not suitable for models with constraints
Daniel
2010/11/26 Jari Oksanen [via R] 
ml-node+3060660-1324000642-57...@n4.nabble.comml-node%2b3060660-1324000642-57...@n4.nabble.com


 Danielwc daniel.carstensen at gmail.com writes:

  Im using the VEGAN package to do an RDA ordination. In my plot I get my
  environmental scores as arrows/vectors, but my species scores as points.
 I
  would like to get the species scores as arrows as well.
 
  Is there not a way I can tell R to plot both environmental and species
  scores as arrows/vectors?

 See ?biplot.rda in vegan.

 Cheers, Jari Oksanen

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[R] RDA Triplot

2010-11-23 Thread Danielwc

Hi
Im using the VEGAN package to do an RDA ordination. In my plot I get my
environmental scores as arrows/vectors, but my species scores as points. I
would like to get the species scores as arrows as well. 

I tried the envfit function, and this creates arrows, but the lenght is not
proportionate to the strengh of the correlation and the point is still there
(so I both have point and arrow).

fit - envfit(rdawal, dat.one, perm = 999, display = wa) 
ordiplot(rdawal, type = p) 
plot(fit, col = red, add = TRUE, scaling = 2) 

Is there not a way I can tell R to plot both environmental and species
scores as arrows/vectors?

Thanks
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Re: [R] Nested variables

2009-06-01 Thread DanielWC

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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[R] Nested variables

2009-05-29 Thread DanielWC

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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