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InvSWM_F(xcoord,ycoord,lower,upper,RowStdOpt)

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InvSWM_F(xcoord,ycoord,lower,upper,RowStdOpt)

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07 May 2010 (Updated )

Creates an inverse-distance SWM, from X and Y coords.Can be used on very large datasets

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Description

Uses x,y coordinates to produce distance-based spatial weight matrices useful for spatial econometric regressions. The user is asked to input x and y coordinates, as well as a lower and upper bound threshold for the neighborhood.
The code is adapted from a previous version by Shawn Bucholtz of the USDA. A correction is made to set the (i,i) th elements (the diagonals) equal to zero.
Unlike other similar programs, this one can be used on very large datasets.

Acknowledgements

This file inspired Inverse And Determinant Of Square Matrix.

MATLAB release MATLAB 7.6 (R2008a)
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Comments and Ratings (4)
05 Feb 2015 Patrick Walsh

If you re-download the file it has now been updated with normbig inside it, so it should work. Check out my other files for alternate types of SWM files. Let me know if you have any questions!

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05 Feb 2015 Patrick Walsh

Vania, sorry about that. Ill update the file to have that nested inside. In the meantime, here it is http://www.mathworks.com/matlabcentral/fileexchange/49545-normbig-sw-

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04 Feb 2015 Vania Salas

Hi, I am trying to run this file but I am having a problem with this line SW=sparse(normbig(SW)) It seems that normbig is not a recognized function and I am trying to find it but without success. Can anybody help me, please?

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03 Apr 2012 Bumseok  
Updates
08 May 2012

Some minor updates, should make code run better.

02 Jan 2013

Updated to include other required programs.

05 Feb 2015

Updated to include normbig file

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