Displaying 20 results from an estimated 1000 matches similar to: "non-linear trends in kriging model"
2003 Sep 04
1
AIC and significance tests
Hi
I have two geostatistical models from geoR. An ordinary kriging model with
AIC=-148.6 and a universal kriging model with AIC=-156.7, there are 345
data points. The improvement shown by the AIC by adding a trend component
to the model seems quite small given the number of data points, is there a
test to see if the improvement to the model fit is significant?
Thanks
David
2008 Aug 15
1
Strange error message from geoR´s likfit () lik. max. func.
ComRades:
I am geeting the error message
Error in ldots[[which(MET)]] : attempt to select less than one element
when I try to fit the geostatistical model with the likfit() function of
geoR.
I have tried with old data for which likfit() successfully maximised the
likelihood in previous versions of geoR, and yet the current version
fails.
I have tried in Windows Vista and Windows XP (I haven't
2013 Apr 04
5
help with kriging interpolation
All,
I am new to using R and know some basics. I wish to use kriging in R to
do the following:
given data Y =f(X1,X2,X3,.....,Xn) --1000+ irregular measured data set.
I would like to be able to get a single value y given sinle input set
(x1,x2,x3,...xn)
A google search on this takes me lierally to the same example on involving
analysis with soil sampling and I cannot figure out how to
2005 Dec 29
1
Help with Kriging
R Experts,
I'm looking for some help with the geoR package. I'm trying to krig
some data without using a global neighborhood. I would like to set my
moving neighborhood to a distance, say 100 meters, where I know my data
is spatially correlated. I have tried the ksline function, but that
only allows my moving neighborhood to be set to a number of data points.
But, since my data
2004 Feb 23
1
border of a polygon in contour.kriging - geoR
Dear all,
When a conventional kriging and then a contour plot is limited with a polygon (as possible with krige.conv and contour.kriging), the
polygon border is displayed in black by default.
> kc<-krige.conv(CZdata,loc=pred.grid,borders=czpoly,krige=krige.control(obj.m=ls))
> plot(CZcoord,xlab="x",ylab="y",type="n",asp=1)
>
2004 Jan 08
1
Using geoR krige.conv
Hi,
I'm using the function krige.conv from package geoR but I'm getting a
warning that I do not understand:
Warning messages:
1: NaNs produced in: sqrt(variance)
2: NaNs produced in: sqrt(variance)
I'm performimg an ordinary kriging with a log transform (lambda=0).
Does anyone knows where this comes from ?
Thanks and regards
EJ
2006 Jan 05
1
Memory limitation in GeoR - Windows or R?
Dear Aaron,
I am really a tool user and not a tool maker (actually an ecologist
doing some biostatistics)... so, I take the liberty of sending a copy of
this e-mail to the r-help list where capable computer persons and true
statisticians may provide more relevant information and also to Paulo
Ribeiro and Peter Diggle, the authors of geoR..
I really feel that your huge matrix cannot be
2010 Aug 04
1
geoR - likfit failure
Hi
I'm using geoR package to perform linear spatial interpolation(OK).
The function likfit() fails to compute REML.
The error meassage is : Error in solve.default(v$varcov, xmat);
How I can find out that likfit() is failed to process and retrieving the error message ?
Thank you so much for your help.
2008 Dec 04
2
Plotting a kriging on a map
Hi list,
Well, this time I’ve a doubt with mapping generation.
I was already able to read and plot shapefiles, plot point on this map. All
this without any problems, but now I want to do something that I think, only
Golden Software Surfer is capable of.
I would like to plot a kriging result on the existing map (map script
below). Well I looked for on the net, but I was not able to be sure of
2008 Aug 18
1
GeoR model.control - defining covariates at prediction locations
Hi,
Im using geoR and I'm trying to do some predictions, based on an external
trend.
I'm having some problems specifying my model.control, specifically how do I
define my model, and also the source of the covariate data at the prediction
locations?
I am assuming that the covariate data at the prediction locations should be
imported to a geodata object along with the prediction location
2012 Nov 07
2
pseudo R-squared with likfit (geoR)
We want to compute a pseudo R-squared for a model whose parameter
estimation was based on maximum likelihood (function likfit, package geoR).
I tried to compute the R2 proposed by Maddala (1983) which compare the
maximized likelihood for the model without any predictor and the
maximized likelihood for the model with all predictors.
I got a really low value (0,01%). Did I miss something? Are
2006 Aug 30
1
Handling realisations in geoRglm
Dear R users:
I want to model mosquito count data based on landcover attributes and
meteorological variables using a Poisson GLSM in the geoRglm package. I
have monthly mosquito counts over more than 20 years with repeated
observations from individual trap sites over time. I have used
as.geodata() to successfully read my dataset into the geodata format
utilized by geoR and geoRglm,
2006 Jun 28
1
calculating the spacial autocorrelation for poisson data
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2004 Oct 05
1
Bug in optim - way to solve problem?
Hi,
I want to automatically fit variograms to a large number of different
sample data sets, and call the funtion "likfit" (in package geoR) from
within a for-loop. "likfit" does again call "optim". After ssuccessfully
fitting variograms to some of the data sets, the procedure crashes and I
get the error message:
Error in optim(par = ini, fn = negloglik.GRF,
2003 Jan 17
3
kriging in R
Hi, all,
Have anyone used kringing included in R? How is it?
Does it handle anisotropy data well?
How does it compare with Kriging in Arc/Info? or other geostatistics
software customized to do kriging or other geostatistics functions?
I tried Easykriging, a geostatistics tool developed for Matlab. It has
very nice GUI, but it does not provide library which i can call in my programs.
so it is
2010 Jan 07
1
kriging with geoR package
Hi all,
I have to draw a map of microorganisms repartition in a sample. I use the
"image" function of geoR package to build the map but there are three
problems:
1) the legend is Horizontal (with or without vert.leg=TRUE)
2) I want to plot the position of organisms and level curves of density on
the map but I don't find the script to insert these data on the map.
3)the grey range
2008 Jul 20
2
Indicator Kriging?
Hello All!
I like to do some indicator kriging with R.
So far I used geoR for simple and ordinary kriging.
Does anybody know which package I should use?
Thanks for your help!
Sascha!
--
Jetzt dabei sein: http://www.shortview.de/wasistshortview.php?mc=sv_ext_mf at gmx
2010 Feb 17
1
Bayesian Block Kriging?
Hello,
I'm interested in doing Bayesian kriging using R. I see that the
package geoR has a function that will allow one to do this
(krige.bayes). However, my data are not in the form of points, but
rather they are blocks that represent spatial averages (i.e., the number
of fishing hooks per month in a given lat x long square). I am
therefore interested in treating the data as
2006 Mar 17
3
can't load "geoR"
Dear R list,
I've just installed R and then followed the instructions to install the
package "geoR" from within R by using the following line of code:
install.packages("geoR", contriburl = "http://www.est.ufpr.br/geoR/windows")
This installed okay under the folder C:\documents and settings\ ...
But when I follow the instructions in the illustrative session
2003 Oct 21
1
Indicator Kriging
Hi R-Users
Is there any package in R that work Indicator Kriging?
Or somebody is working in a link between GSLIB library in
FORTRAN for R?
Thank you very much for your help.
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