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GWR Output Attributes

3 messages · James Garrett, Roger Bivand

Original
James Garrett
# 
Dear R-Sig-Geo List,

I am hoping to verify the output variables from a gwr model (package
spgwr). I've searched through the archives and haven't been able to find
exactly what a few are, although I have a strong guess from the package
description:

 SDF a SpatialPointsDataFrame (may be gridded) or SpatialPolygonsDataFrame
object (see package "sp") with *fit.points, weights, GWR coefficient
estimates, Rsquared, and coefficient standard errors in its "data" slot.*

Is this correct?
sum_w = sum of the weights
Intrc = X Intercept
gtVI(F) = GWR coefficient estimates of the X intercept
gwr_e = gwr residuals
pred = Y prediction
localR2 = local R2.

I apologize if this is rudimentary. Thanks so much in advance,

James
Roger Bivand
#
On Tue, 26 Mar 2019, James Garrett wrote:

            

      
      
      
    

        
There is no need to guess. Help pages have examples. Run:

library(spgwr)
example(gwr)
str(col.gauss)
str(col.gauss$SDF)
names(col.gauss$SDF)

to examine the contents of the objects of the first run. Note that the 
rest of the example script shows why GWR is unreliable.

Don't guess, don't google or SO, just use the examples in the help pages 
actively, for example changing the formula or argument values to see what 
the arguments do. Do use alternative implementations to check your 
assumptions, such as GWmodel. Do read vignettes: vignette("GWR").

Hope this helps,

Roger

            

      
      
      
    

        

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Roger Bivand
    

    

      
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On Tue, 26 Mar 2019, Roger Bivand wrote:

        

            

      
      
      
    

        
I've just used pkgdown to commit the processed help pages of spgwr to 
R-Forge:

http://rspatial.r-forge.r-project.org/spgwr/reference/gwr.html#examples

is the rendered version of running example(gwr) yourself, and is less 
effective because you can't play with the output.

Roger