[R-sig-Geo] hat matrix in gwr

[Myers, Joshua]

>From my experience, 3055 observations should not make anything crash or
freeze, although it may take a while to complete the run.  

A few thoughts:

I would make sure you are running the most up-to-date version of spgwr
(and dependent packages) and R.  

Also, I am not an R expert, but it may be that storing the hat matrix is
taking up a lot of memory and causing R to freeze.  It is a long-shot,
but start a clean workspace and try the gwr run again.  Roger, though,
is the one that is more likely to know what is wrong than anyone else.

In addition, make sure you aren't over-fitting your models.  Too many
variables in gwr can cause many problems, not the least of which is the
time it takes to complete the run.


-----Original Message-----
From: r-sig-geo-bounces at stat.math.ethz.ch
[mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf Of Eda Laze
Sent: Thursday, November 05, 2009 8:27 AM
To: r-sig-geo at stat.math.ethz.ch
Subject: [R-sig-Geo] hat matrix in gwr

Hello,

I am currently using *gwr to make a spatial analysis. Dataset has 3055
observations. As read, this is a considerable number for gwr R to run.
 However, so far, I have suceeded to get local R2 (SDF), etc.

The problem is to get "hatmatrix". When I add "hatmatrix=TRUE" to the
code
(which I get localR2 with), R freezes. I must get hat matrix to
calculate
Moran'I and AICc to compare models.

Could be this a case of large number of observations, or do I miss
anything
else. Furthermore, I could get once AICc with the same dataset and code,
but
not anylonger.

Any feedback is more than welcome. Thank you.

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