Re: auto-correlation of nominal variables (Rich Shepard)

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Re: auto-correlation of nominal variables (Rich Shepard)

Emanuele Barca
Thank you Rich for your suggestion, is indeed intersting!

Actually, my interest is in finding a clustering tendency of
crop-classes.

Therefore, joincount.multi of spdep library is perfect for my aims.

I would like to find a function for representing graphically such
tendency.

thanks once more.

emanuele



Il 2019-06-19 12:00 [hidden email] ha scritto:

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>    1. GAM parameters: Biomod 2 (Lara Silva)
>    2. Re: auto-correlation of nominal variables (Rich Shepard)
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> Message: 1
> Date: Tue, 18 Jun 2019 13:46:08 +0000
> From: Lara Silva <[hidden email]>
> To: [hidden email], [hidden email]
> Subject: [R-sig-Geo] GAM parameters: Biomod 2
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> Hello,
>
> I am using Biomod 2 to modelling species distribution. I ran some
> algorithms like GAM, GLM, RF and CTA.
>
> I did not change the parameters. How can I known the quadratic terms of
> GAM?
>
>
> I used the variables with form linear (e.g.  precipitation, altimetry,
> temperature) I did not use temperature ^2.
>
>
> Any suggestions?
>
> Regards,
>
>
> Lara
>
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> ------------------------------
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> Message: 2
> Date: Tue, 18 Jun 2019 07:51:09 -0700 (PDT)
> From: Rich Shepard <[hidden email]>
> To: [hidden email]
> Subject: Re: [R-sig-Geo] auto-correlation of nominal variables
> Message-ID:
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> On Sun, 16 Jun 2019, Emanuele Barca wrote:
>
>> I received a  dataset of point data, organized in the following way: a
>> couple of coordinates and a column of "crop classes codes", three
>> columns.
>
>> I would like to compute something similar to the Moran index for each
>> crop
>> class code.
>
> Emanuele,
>
> What is your interest in these data? Are you interested in the pattern
> of
> crop classes (such as in epidemiology or designing a timber sale) or
> something else?
>
> If it is the pattern that is of interest I suggest you first test for
> complete spatial randomness. Look at some of the references and R
> packages
> for spatial point processes. The distribution of crop classes could be
> random, regular, or clumped/clustered.
>
> Peter Diggle's book, "Statistical Analysis of Spatial Point Patterns,"
> and
> "Spatial Point Patterns" by Adrian Baddeley, Ege Rubak, and Rolf Turner
> would be excellent places to start.
>
> Hope this helps,
>
> Rich
>
>
>
>
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Re: auto-correlation of nominal variables (Rich Shepard)

Rich Shepard
On Wed, 19 Jun 2019, Emanuele Barca wrote:

> Actually, my interest is in finding a clustering tendency of crop-classes.
> Therefore, joincount.multi of spdep library is perfect for my aims.

Emanuele,

Glad I helped.

> I would like to find a function for representing graphically such tendency.

My spatio-temporal work almost always involves geostatistics, not point
processes. For the latter, in addition to the two books I suggested
yesterday, take a look at "Spatial and Spatio-temporal Bayesian Models with
R - INLA" by Marta Blangiardo and Michela Cameletti. They have a lot of
graphics with their examples, some of which you might find useful.

Best regards,

Rich

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