How can I do boxcox transformation for explanatory variables and use it in a multiple linear regression?


 
Kind regards,

ISRAEL O. IKOYI
MSc. Thesis Research Student
Wageningen University 
Department of Soil Quality 
P.O. Box 47 
NL-6700 AA Wageningen 
The Netherlands



________________________________
 From: "r-sig-geo-request@r-project.org" <r-sig-geo-request@r-project.org>
To: r-sig-geo@r-project.org 
Sent: Wednesday, June 26, 2013 12:00 PM
Subject: R-sig-Geo Digest, Vol 118, Issue 25


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Today's Topics:

   1. Re: spatial networks (Forrest Stevens)
   2. NetCDF to Brick (JacobF)
   3. Re: Is it possible to merge togheter different ENFA    results?
      (Mathieu Basille)
   4. Problems with readOGR (Renger van Nieuwkoop)


----------------------------------------------------------------------

Message: 1
Date: Tue, 25 Jun 2013 09:17:36 -0400
From: Forrest Stevens <forrest@ufl.edu>
To: "r-sig-geo@r-project.org" <r-sig-geo@r-project.org>
Subject: Re: [R-sig-Geo] spatial networks
Message-ID:
    <CAEBQMM=PrKEYQKL=ViksG+oBYGd6J4-0KtKe44EWX0Vdt6Vojw@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

Hi Edzer, this is definitely very cool.  This may make some recent
work I've been doing on spatial and social network analyses of
academic co-authorship easier (early code is here if you're
interested:  http://refnet.r-forge.r-project.org/ ).  Thanks for
[[elided Yahoo spam]]

Sincerely,
Forrest

On Sun, Jun 23, 2013 at 10:20 PM, Thomas Adams <tea3rd@gmail.com> wrote:
> Edzer,
>
> That's really pretty cool stuff; I think I can find some applications for
> it!
>
> Cheers!
> Tom
>
>
> On Sun, Jun 23, 2013 at 5:57 PM, Edzer Pebesma <
> edzer.pebesma@uni-muenster.de> wrote:
>
>> I did some simple things trying to combine sp and igraph objects to
>> create spatial networks, and published this at:
>>
>> http://rpubs.com/edzer/spatialnetworks
>>
>> I'd be happy to share the markdown document with you; it seems to me
>> that the rpubs don't allow you to simply download & run all the commands
>> in the html.
>>
>> Anyway, comments & discussion welcome, as usual.
>> --
>> Edzer Pebesma
>> Institute for Geoinformatics (ifgi), University of M?nster
>> Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251
>> 83 33081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo@r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>
>         [[alternative HTML version deleted]]
>
>
> _______________________________________________
> R-sig-Geo mailing list
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>



--
Forrest R. Stevens
Ph.D. Candidate, QSE3 IGERT Fellow
Department of Geography
Land Use and Environmental Change Institute
University of Florida
www.clas.ufl.edu/users/forrest



------------------------------

Message: 2
Date: Tue, 25 Jun 2013 10:53:41 -0700 (PDT)
From: JacobF <jsf2fa@mail.missouri.edu>
To: r-sig-geo@r-project.org
Subject: [R-sig-Geo] NetCDF to Brick
Message-ID: <1372182821195-7583910.post@n2.nabble.com>
Content-Type: text/plain; charset=us-ascii

I'm having an issue with creating a raster brick from a NetCDF. Normally this
works fine but for a file I recently downloaded the time and X dimensions
are getting swapped so I get a brick with dimensions 72, 7300, 525600, 110
(nrow, ncol, ncell, nlayers), when it should be 72, 110, 7920, 7300  (nrow,
ncol, ncell, nlayers). I haven't seen any documentation for setting the x, y
and z variables when creating a brick, only when outputting one as a NetCDF.



--
View this message in context: http://r-sig-geo.2731867.n2.nabble.com/NetCDF-to-Brick-tp7583910.html
Sent from the R-sig-geo mailing list archive at Nabble.com.



------------------------------

Message: 3
Date: Tue, 25 Jun 2013 14:55:26 -0400
From: Mathieu Basille <basille.web@ase-research.org>
To: Michela Giusti <michela.giusti@isprambiente.it>
Cc: "r-sig-geo@r-project.org" <r-sig-geo@r-project.org>
Subject: Re: [R-sig-Geo] Is it possible to merge togheter different
    ENFA    results?
Message-ID: <51C9E79E.1060704@ase-research.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Dear Michela,

I'm not quite sure to understand what you really intend to do. I can see 
that you performed individual ENFAs for each of your study site. This is 
fair, although you might be interested in the OMI for that multi-niche 
comparison (see ?niche in package ade4, and reference [1]).

But now, you want to perform a MADIFA on top of this? It does not make 
sense to me... Here, I'm really not sure what you want to do.

Finally, a single analysis for the 3 sites at once might also make sense, 
and this is largely feasible with R. It will need a little bit of tweaking
though. All you have to do is to combine the results after the extraction 
of the environmental characteristics and the vector of presence (before the
PCA).

Hope this helps,
Mathieu Basille.


[1] Doledec, S.; Chessel, D. & Gimaret Carpentier, C. (2000) Niche 
separation in community analysis: A new method. Ecology, 81: 2914-2927 doi
10.1890/0012-9658(2000)081[2914:NSICAA]2.0.CO;2


Le 06/25/2013 05:36 AM, Michela Giusti a ?crit :
> Hello everybody ,
>
> I have a question regarding ENFA process.
>
> I have 3 sites far from one another along the Mediterranean Sea.
> I performed 3 different ENFA (one for each site; the species is the same
> for each site).
>
> Now I would like to merge togheter the 3 ENFA results to have the final
> result and to perform the final MADIFA on it.
>
> Is it possible to do that? I tryed also to do a single ENFA on the 3 sites
> from the beginning of my analysis , but I had problems with the extents of
> the rasters.
>
> Thank you very much for your help.
>
> Bye,
>
> Michela
>

-- 

~$ whoami
Mathieu Basille, PhD

~$ locate --details
University of Florida \\
Fort Lauderdale Research and Education Center
(+1) 954-577-6314
http://ase-research.org/basille

~$ fortune
? Le tout est de tout dire, et je manque de mots
Et je manque de temps, et je manque d'audace. ?
  -- Paul ?luard



------------------------------

Message: 4
Date: Wed, 26 Jun 2013 09:16:39 +0000
From: Renger van Nieuwkoop <renger@vannieuwkoop.ch>
To: "R-sig-Geo@r-project.org" <R-sig-Geo@r-project.org>
Subject: [R-sig-Geo] Problems with readOGR
Message-ID:
    <5E17CCD4AACE3A4C8CFF411186AE81903195E59C@ExDAG30-N1.hostallapps.net>
Content-Type: text/plain

Hi

I tried running the following code using the shapefiles for the city of Zurich

require("rgdal") # requires sp, will use proj.4 if installed
require("maptools")

zh = readOGR(".",layer="Zurich")
and got following error:
OGR data source with driver: ESRI Shapefile
Source: ".", layer: "Zurich"
with 34 features and 6 fields
Feature type: wkbPolygon with 2 dimensions
Fehler in CRS(p4s) : lat_0 = 0 or 90 or alpha = 90


ogrInfo gives me this:

ogrInfo(".","Zurich")

Source: ".", layer: "Zurich"

Driver: ESRI Shapefile number of rows 34

Feature type: wkbPolygon with 2 dimensions

Extent: (676227 241585) - (689671 254305.7)

CRS: +proj=omerc +lat_0=46.95240555555556 +lonc=7.439583333333333 +alpha=90 +k=1 +x_0=-9419820.590700001 +y_0=200000 +ellps=bessel +units=m +no_defs

LDID: 87

Number of fields: 6

        name type length typeName

1    GMDEQNR    0      7  Integer

2         NR    0      9  Integer

3       NAME    4     45   String

4       GMDE    0      9  Integer

5 FLAECHE_HA    0      9  Integer

6   Quartier    0      4  Integer


I can see that lat_0 is not equal to zero, but don't know how to resolve this issue.

Thanks in advance for help

Renger


_________________________________________
Renger van Nieuwkoop
Centre for Energy Policy and Economics, ETH
Zürichbergstrasse 18 (ZUE)
CH - 8032 Zürich
+41 44 632 02 63
mailto: rengerv@etzh.ch<mailto:rengerv@etzh.ch>
blog.modelworks.ch


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