[R-sig-Geo] FW: GWAR - R

[Inaki Sagarzazu]

Hi Roger

Thanks for your response. I am not sure why there can't be polygons with missing info. Is it something with the model or the estimation? 

Also, How can I drop the NA's from a shape file in R? I've tried but can't seem to be able to do it.

Thanks

Inaki

On 24 Sep 2011, at 08:27, "Roger Bivand" <Roger.Bivand at nhh.no> wrote:

> On Thu, 22 Sep 2011, Inaki Sagarzazu wrote:
> 
>> 
>> Hi,
>> 
>> I am trying to use gwr in R but I'm having problems because some of my 
>> polygons have missing values (NA) for the variables of interest. Do you 
>> have any suggestions on how to solve this?
> 
> If data is missing in the response or covariates, all bets are off. You
> could drop those observations, or incomplete variables. You could try to 
> impute the values, but then standard results would not hold downstream.
> 
> Roger
> 
>> 
>> thanks
>> 
>> ---------------------------------------------------------------------------------------------------------------
>> Iñaki Sagarzazu, PhD
>> Research Officer
>> Nuffield College
>> University of Oxford
>> OX1 1NF Oxford
>> United Kingdom
>> 
>> Office: 44 (0) 1 865 614990
>> Inaki.Sagarzazu at nuffield.ox.ac.uk
>> http://www.inaki-sagarzazu.com
>> 
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> 
> -- 
> Roger Bivand
> Department of Economics, NHH Norwegian School of Economics,
> 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