Re: [R-sig-eco] How to accommodate data with negative values for Canonical Correspondence Analysis in R using "vegan" Package

I'm still struggling to see why we'd expect temperature to be well modelled via a species packaging model??? G On 26 February 2014 16:21, Chris Howden wrote: > Whenever I hit this problem I add the minimum to all scores so they > now range from 0 and above. If necessary I can back transform. > >

Re: [R-sig-eco] How to accommodate data with negative values for Canonical Correspondence Analysis in R using "vegan" Package

Whenever I hit this problem I add the minimum to all scores so they now range from 0 and above. If necessary I can back transform. As I haven't changed the ratio the parameters coefficients have the same meaning, so interpretation is no problem. (Although the intercept may now change and be diffic

Re: [R-sig-eco] How to accommodate data with negative values for Canonical Correspondence Analysis in R using "vegan" Package

It depends *where* to include negative values. Negative values are OK as constraints (environmental variables, right hand side of the model formula). However, all marginal sums of the response data (left hand side of the model formula) must be above zero. It is technically possible to have some

Re: [R-sig-eco] How to accommodate data with negative values for Canonical Correspondence Analysis in R using "vegan" Package

On Wed, Feb 26, 2014 at 2:43 PM, Rajendra Mohan panda wrote: ... > I have temperature data with negative values which I am not able to include > for my CCA ordination. ... Rajendra, I am curious -- why are you not able to include the negative values in the CCA ordination? -- "The cure for bored

[R-sig-eco] Guidance on adehabitat usage

Dear forum members I had successful use adehabitatHR R package to estimate home ranges for jaguar based on collar data. Now I'm trying to analyse relocations with adehabitatLT package following the vignette ( http://cran.r-project.org/web/packages/adehabitatLT/vignettes/adehabitatLT.pdf). But some

Re: [R-sig-eco] How to accommodate data with negative values for Canonical Correspondence Analysis in R using "vegan" Package

Rajendra, Would converting the temperatures to degrees Kelvin work? (You cold back-transform after analysis when presenting results/figures.) Cheers, Phil On 2/26/2014 6:43 AM, Rajendra Mohan panda wrote: > Dear All > > I have temperature data with negative values which I am not able to include

[R-sig-eco] How to accommodate data with negative values for Canonical Correspondence Analysis in R using "vegan" Package

Dear All I have temperature data with negative values which I am not able to include for my CCA ordination. Kindly suggest how can I go with the analysis without ignoring the data with negative values. With best Regards Rajendra M Panda SWR, IIT KGP [[alternative HTML version deleted]]