Dear all,
I performed a census of insects at different sites and measured there size. I
would like to know if size is related to an environmental factor. I modelled
the size as a
fonction of the factor with site as a random variable to account for
within-site variability. However I have
An alternative might be to consider cyclic splines in mgcv? this would
enable you to fit a gam(m) with two 'ends' (1deg and 359 deg) that match
up, but might allow more flexibility than combinations of sine/cosine?
something along the lines of gam(response ~ s(exposure, bs='cc'),
family=...)
I've
Peter,
For my purposes (I.e., estimating exposure and drying potential in
northern hemisphere temperate forests), I simply subtract 45 degrees from
the measured aspect in degrees, convert to radians, and then take the
cosine of the adjusted angle. If I want to make exposure positive, I then
Hi Krysztof,
Did you have a specific section of Zuur et als book in mind? I've pulled
it off my shelf and tried looking up shrinkage, unbalanced design, design,
etc in the index but couldn't find anything relevant. I'm sure it's in
there, but it’s a rather large book to read in 1 go!!
Chris
Dear list,
I write you because I do not understand the behavior of envfit() in vegan.
Basically, it takes a matrix coming from an ordination procedure and it fits on
it another matrix (often an environmental matrix).
The projections of points onto vectors have maximum correlation with
On Wed, Oct 16, 2013 at 6:20 PM, Chris Howden
ch...@trickysolutions.com.au wrote:
Hi Krysztof,
Did you have a specific section of Zuur et als book in mind? I've pulled
it off my shelf and tried looking up shrinkage, unbalanced design, design,
etc in the index but couldn't find anything
Thanks Krzysztof,
Your explanation makes a lot of sense.
Chris Howden B.Sc. (Hons) GStat.
Founding Partner
Evidence Based Strategic Development, IP Commercialisation and Innovation,
Data Analysis, Modelling and Training
(mobile) 0410 689 945
(skype) chris.howden
ch...@trickysolutions.com.au
