On Thu, 28 Oct 2010, Pinar Aslantas Bostan wrote:
Dear all,
I performed gwr() and obtained predictions for 31223 data points. Now I
want to calculate prediction error variance at each estimation point. Is
there a function to calculate them or do you have any idea about
calculating these values?
You need to pass in a fittedGWRobject, and set se.fit, to provide the
estimate of sigma needed to achieve this. The fitted object must have a
hatmatrix, which is not possible with this N, so you will have to
subsample to be able to get the sigma based on effective degrees of
freedom. I don't think that this has been tried, and I'm not sure what it
provides of value, given the uncertainty present about the method.
Hope this helps,
Roger
Thanks!
Pinar
********************************************************************************
Pinar Aslantas Bostan
Research Assistant
Department of Geodetic and
Geographic Information Technologies (GGIT)
Middle East Technical University
06531 Ankara/TURKEY
aslan...@metu.edu.tr
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: roger.biv...@nhh.no
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