[R-sig-Geo] gwr.sel, missing values

[Roger Bivand]

On Wed, 15 Apr 2009, Sven Müller wrote:

> Hi all,
>
> I have the following problem with finding an adaptive kernel in GWR. I use 
> R2.8.1. In my dataset I have a few variables with missing values. Now, I try 
> to find a bandwith for an adaptive kernel using 'gwr.sel' and it gives the 
> following error message:
> Warning in w.i * weights: Length of the longer object is not a multiple of 
> the shorter object
> If I run 'gwr.sel' using variables without missing values everything is 
> working fine. Just for the variables with missing values this error message 
> occurs.
> What is my fault?

Including missing values on the data points. Don't do it - you cannot fit 
the local regressions there, so they should be subsetted out first. Look 
at the output of lm() of the same model, with default na.action it will 
show that you have lost observations.

Roger

> Every hint is gratefully acknowledged.
>
> Cheers
>
> Sven
>
>

-- 
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.Bivand at nhh.no