Message-ID: <5024AFE4.4060701@uibk.ac.at>
Date: 2012-08-10T06:53:24Z
From: Maximilian Sproß
Subject: gwr, calculate hatmatrix when fit points are given
In-Reply-To: <alpine.LRH.2.02.1208091359410.26060@reclus.nhh.no>
Ok, thank you for clarifying Roger!
best wishes,
Max
On 08/09/2012 02:15 PM, Roger Bivand wrote:
> On Thu, 9 Aug 2012, Maximilian Spro? wrote:
>
>> Dear list,
>>
>>
>> when running gwr() with given fit.points, it is not possible to
>> calculate the hatmatrix. But it would be very helpful to get the
>> fitting characteristics such as AIC or RMSE with the gwr output. In
>> my case the fit points have to be set, as i run gwr on a cluster.
>
> According to information from the authors, it seems that GWR3 fits
> without fit points first to generate a hat matrix for the data points.
> This is then used in a further step for the fit points, for which no
> covariates are observed. The assumption is that #data points << #fit
> points, as when making a raster. This may be done I think by doing the
> same, first running gwr() on the data points only and making the hat
> matrix, next fitting on the fit points and including the output of the
> first step in the fittedGWRobject= argument. However, the fitted
> object will only help in giving local R2 (GWR4 version), and local
> coefficient and prediction standard errors, not AIC.
>
> Roger
>
>>
>> I appreciate if anyone can help!
>>
>> all the best,
>>
>> Max
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>
--
Mag. J. Maximilian Spro?
Institute of Geography, University of Innsbruck
Innrain 52
A-6020 INNSBRUCK
Tel. +43 (0)512 507 5413
web: http://www.uibk.ac.at/geographie/projects/lidar/