[Gretl-users] spatial statistics

[Ignacio Diaz-Emparanza]

El Thursday 29 November 2007 11:02:03 Franck Nadaud escribió:
> Hello listers ! greetings from Paris !
>
> > This would be brilliant.
>
> Sure it would be useful in some contexts. I am on the way to convert some
> old scripts I wrote in SPSS matrix processing language some (long) time
> ago. I plan to propose the Moran and Geary spatial correlation coefficients
> first. They are used as residuals mispecification tests when a regression
> model uses data related to a spatial context (States, counties, measure
> stations, etc...).
>
> > One of the thing planned for future versions is a function for
> > reading/writing matrices from/to csv files. Would this be useful to you?
>
> That would be exactly what is needed for the task. In fact most spatial
> analysis toolboxes / softwares proceed exactly that way around.

There is'nt  actually a standard procedure for saving and reading matrices, 
but Allin was working about this subject some months ago. You can read his 
message to the gret-devel list in
http://lists.wfu.edu/pipermail/gretl-devel/2007-April/000326.html

Probably I should not recommend this tricky procedure to everyone, but ....
I do it in this way:

To save the matrix:
<script>
set echo off
outfile --write "myfile.xml"
print "<?xml version="1.0"?>"
print "<gretl-matrices count="1">"
print "<gretl-matrix name="mymatrix" rows="3" cols="2">"
print "1.3 2.0"
print "3.4 2.7"
print "8.2 3.1"
print "</gretl-matrix>"
print "</gretl-matrices>"
outfile --close
set echo on
</script>

To read the matrix:

include myfile.xml



-- 
Ignacio Diaz-Emparanza  
DEPARTAMENTO DE ECONOMÍA APLICADA III (ECONOMETRÍA Y ESTADÍSTICA)                                        
UPV/EHU
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