On Thu, May 20, 2010 at 3:20 PM, Lucia Rueda wrote:
>
> Hi,
>
> Thanks for the inputs. I talked to my coworker, who has been the one doing
> the analysis. Perhaps I wasn't making myself clear about the differences
> in
> spatial scales. Here is what he says:
>
> "The truth is that measuring sc
Hi,
Thanks for the inputs. I talked to my coworker, who has been the one doing
the analysis. Perhaps I wasn't making myself clear about the “differences in
spatial scales”. Here is what he says:
"The truth is that measuring scales (i.e all area related variable are
measured in m2) and spatial d
On Wed, May 19, 2010 at 4:51 PM, Lucia Rueda wrote:
>
> Hi Joris,
>
> We're using mgcv.
>
> We have data on abundance of groupers on line transects that have the same
> length.
I only now realized groupers are actually fish :-). Should work on my
english skills...
> My coworker has selected a
Thank you for the correction. I was thinking about the difference of using a
variable with a smoother, and comparing that to a model with that variable
without smoother. I should specify that I mostly use thin plate regression
splines.
If the spline itself is not deviating from linearity, you get
Hi Joris,
We're using mgcv.
We have data on abundance of groupers on line transects that have the same
legth. My coworker has selected a bunch of variables and he has calculated
them in terms of total area in different sizes of buffers around the
centroid of the transect. He has run gam models
> We are analizing the relationship between the abundance of groupers in line
> transects and some variables. We are using the quasipoisson distribution.
> Do we need to include the length of the transects as an offset if they all
> have the same length??
--- not just for fitting, I suppose: altho
On Wednesday 19 May 2010 15:29, Joris Meys wrote:
> Could you specify the package you use? If it is mgcv, this one centers your
> variables before applying the smooths. That's something to take into
> account when comparing different models.
--- er, actually it only centres variables in this way fo
Could you specify the package you use? If it is mgcv, this one centers your
variables before applying the smooths. That's something to take into account
when comparing different models.
In any way, If scales are too different, I try rescaling by either :
- expressing things in different units (met
Could you specify the package you use? If it is mgcv, this one centers your
variables before applying the smooths. That's something to take into account
when comparing different models.
In any way, If scales are too different, I try rescaling by either :
expressing things in different units (meter
Hi,
We are analizing the relationship between the abundance of groupers in line
transects and some variables. We are using the quasipoisson distribution. Do
we need to include the length of the transects as an offset if they all have
the same length??
Also, can we include in the gam models vari
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