Hi James,
How many areas do you have? Also, 40K seems too much. Try to reduce it
to 4K. I believe that this number is not the total number of iterations
(including thinning) but the number of iterations to keep after
thinning. So, if you set it to a thinning of 10 and 4K iterations
OpenBUGS will
Hi Virgilio,
I just did some testing based on what you said.
You are right! Thanks! The number is the number of iterations to keep!
This was not obvious to me from any documentation
But - great thanks problem fixed. Not familiar with INLA and too far into this
to change now but since these
Hi all,
Doing some spatial smoothing using the BYM model from the ASDAR book.
I was using Winbugs but had lots of troubles so switched to Openbugs.
Unfortunately having a new problem running out of memory.
I have tried to fix it with thinning - however Openbugs does not seem to want
to thin.
My
Hi all,
So I have created some maps in R, smoothed then using the BYM model in Openbugs
and opened the CODA files in R once again to analyze results etc.
I would like to now test for clusters using SaTScan and the post smoothing data
- but I can find very little info anywhere on how to output
Hi James,
Not sure how to do that, but check out SpatialEpi and Dcluster packages, I
believe they can do a lot of what SaTScan does..
Cheers, Hugh
From: roone...@tcd.ie
To: r-sig-geo@r-project.org
Date: Mon, 26 Aug 2013 16:42:55 +0100
Subject: [R-sig-Geo] output data from R to SaTScan
Hi
Hi, I am making lattice plots with levelplot(), where my data are on a regular
grid in longitude and latitude, and I want to plot state boundaries as an
overlay for reference. How can I do this so that the plot looks more
geographically true, with states having the appearance we are used to?
Hello,
I'm having trouble creating an STFDF object from my spacio-temporal data.
The object is intended to be used later to perform kriging interpolation.
My data looks like this (a few lines):
xy tvalue
130 30 497826 6.6
2 960 30 499430 7.4
3 1890 30
If you don't have every time value at every spatial point, then you can't
have an STFDF object, as by definition STFDF is a full space by time grid.
The equation in the error is part of the definition/requirement for an
STFDF object.
SDIDF objects don't have that requirement of all times at all
I would like some help with programming moving window comparison of spatial
point data vs raster data. To account for georeferencing errors in the
remote sensing data r I'd like to calculate error statistics such as MAE in
250 m increments given a 500m product. So in the example below, a 1km x 1km
Scott--
Instead of using lattice::levelplot directly, you can use the raster
package for your regular grid data + projection information, and the
rasterVis package rasterVis::levelplot. You can then either use
panel.spplot to overlay your state outline polygons, or use
latticeExtra:layer and
Hi Hugh,
Thanks for your answer. Yes I've seen it said that those packages can do most
of what SaTScan does.
I'm playing with Kulldorff's Statistic as implemented in section 11.5.6 of
ASDAR - but a few things confuse me:
1. How do I decide what the correct value for fractpop is ? I initially
Hi JAmes,
I'm afraid I've never used the packages so I'm no expert. But in answer to your
questions..
1. Kulldorf recommends a fract pop of 0.5 but I guess if you have a reason to
believe there is a different upper limit then you could compare results.
Remember, this is the fraction of the
What happens if you try these, derived from the examples in ?rgdal:
## from ?readOGR
dsn - system.file(vectors, package = rgdal)[1]
## then read two of the shapefiles in that directory
cit - readOGR(dsn,'cities')
plot(cit)
tmp - readOGR(dsn,'trin_inca_pl03')
plot(tmp)
They work for me, also
Hi Tom,
Thanks for the response. I would like to interpolate for values in the
'value' column given different x, y and t values. I was hoping to use the
krigeST function but I just did a little bit of searching and it appears as
though it won't work with anything other than STFDF objects. Do I
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