Displaying 12 results from an estimated 12 matches for "geoda".
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2008 Mar 31
1
GeoDa spdep
My question is in regard to the spdep and GeoDa packages. Do you know how
to extract a neighborhood/adjacency matrix from R? I need a matrix that has
all the neighborhoods on the X and Y axis, and then a r=1 when the
neighborhoods touch, and a r=0 when neighborhoods don't touch. I
think the Moran's I functions use a matrix like this w...
2004 Aug 23
2
Reading GAL file
Greetings:
I am trying to work with spdep (everything is "brand new" downloaded this morning). OS = Windows 2000 (also up to date). The code I am using follows:
#example
gal.county=read.geoda("lnpilnd.GAL", row.names=NULL, skip=0)
summary.nb(gal.county)
Error in summary.nb(gal.county) : Not a neighbours list
#end
The gal file works just fine in GeoDa (also up to date).
Thanks, I am really stuck here.
Mihai Nica
Jackson State University
155 B Parkhurst Dr.
Jackson, MS 392...
2003 Aug 21
4
Importing data into R
Hello. I have been working with GeoDA, and have created a spatial weights
file for my data. I am now looking to use R to run regressions on this
data. However, I don't know and can't figure out how to get my data into R
to run these regressions.
I have the data in many formats, from a .dbf file to an Excel spreadsheet,
but I...
2006 Mar 24
1
who can tell me the reason why it is different on calculating Moran's I using ARCGIS, Geoda and R?
The attachment is my dataset:
1.ccc.shp (the original data)
2.ccc.gwt, which is computed by Geoda;
Introduction to the variables in my data:
ID: key variable;
N_LATITUDE: latitude measured by GPS;
E_LONGITUD: longitude measured by GPS;
LIVES: attribute data
I get the different result of Moran's between ARCGIS and Geoda, R, why?
ARCGIS:spatial statistics tools:spatial autocorrelation(M...
2006 Dec 07
0
FW: test of spatial dependence?? - ask a geographer (was ask an ecologist)?
No, you do not necessarily need the XY coordinates. You can also use polygon
(field, in your case) adjacency information. See Rogerson, Peter A. 2001.
_Statistical methods for geography_. Thousand Oaks: Sage.
You might also look at GeoDA, a free and soon-to-be open source spatial
analysis package. For your application, it might be easier to use than R. Go
to https://www.geoda.uiuc.edu/.
Marshall Feldman
Center for Urban Studies and Research
The University of Rhode Island
-----Original Message-----
From: Milton Cezar Ribeiro [m...
2004 Aug 25
1
Newbie Question: Spatial Autocorrelation with R Tutorial?
Howdy All,
I am looking for some good tutorials (books, websites, whatever) for calculating/testing for Spatial Autocorrelation using R.
Specifically, I am wanting to test for autocorrelation of a number of variables measured at a set of discrete locations.
Up to this point I have been exploring the "spdep" package and I can get "moran.test" to work, but I am concerned that
2007 Feb 06
2
How to do "moran's I test"?
I want to do "moran's I test" in R language. I try to use "gearymoran" in
Package "ade4","moran" in Package "spdep", and Moran.I in Package "ape". But
I do not know how to do it because data format is different.
My data:
x y dbh
111.03 10.7 7
118.11 0.28 1.2
165.36 0.36 8.4
2004 Feb 19
1
How to create a "nb" object?
Hi group,
I'd like to do spatial analysis of my data using the spdep package. It appears that a file of class nb is necessary, but I do not find what that should look like and if there is a function that creates such file for me.
How can I create a nb-object of my data points?
Thanks,
René Eschen.
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2009 Aug 31
1
R2 for SAR and validation
Hi everyone,
How can i obtain R2 for SAR model? and how can i validate the results, can i use the coefficients directly in a simple formula like y=b0+b1*x1+... or do i have to use the complicated formula for SAR (the one with the weight matrix and rho and...)?
Thanks for any help!
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2012 Sep 27
0
error while estimating spatial Durbin (mixed) model
Dear all,
I am new here ,I attempted to use R to estimate the spatial Durbin (mixed)
model,and mydata is a panel data form,and the matrix is generated by geoda
software ,here is my Command and error,really hope your help ,thank you!
#??gal
library(spdep)
w<- read.gal("E:/splm/zj.GAL",override.id=TRUE)
ww<-nb2listw(w,zero.policy=TRUE)
#????
library(foreign)
mydata<-read.dta("E:/splm/merge.dta")
#??
library(splm)
fm<-lrinco...
2005 Jan 30
1
New user...tips for spdep?
Hello List,
I'm a very new user to the R system. I'm only beginning to learn the
basics, but so far I've been able to do little more than try a few examples,
and of course begin reading the documentation.
My primary motivation for exploring R is the availability of tools like the
'spdep' package for calculating spatial statistics such as Geary's C and
Moran's
2004 Aug 27
1
selecting unique columns of a matrix/data frame
...that a little. Completing and improving this vignette
> is on my TODO list.
>
> If you are unsure of the result, and want to stay within the R framework,
> consider calculating Moran's I using DCluster, or gearymoran() in "ade4".
> Beyond that, you could access the GeoDa software (Windows, not R) and
> documentation at http://sal.agecon.uiuc.edu/csiss/geoda.html, the site
> also housing the R spatial projects web pages:
>
> http://agec221.agecon.uiuc.edu/csiss/Rgeo/
>
> Please contact me off-list, or on the R-sig-geo list if you feel that
>...