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# st: SPATGSA

 From Ivan Png To statalist@hsphsun2.harvard.edu Subject st: SPATGSA Date Sun, 31 Oct 2010 11:34:07 +0800

```Greetings!

I'm trying to estimate spatial correlation.  I gave the following commands:

use moran_working.dta , clear
spatwmat , name(wts) xcoord(longitude) ycoord(latitude) band(0, 1000)
spatgsa rd_int , weights(wts) moran

The result was nothing:
The following matrix has been created:

1. Inverse distance weights matrix wts
Dimension: 511x511
Distance band: 0 < d <= 1000
Friction parameter: 1
Minimum distance: 0.0
1st quartile distance: 0.5
Median distance: 2.8
3rd quartile distance: 5.4
Maximum distance: 10.5
Largest minimum distance: 2.59
Smallest maximum distance: 5.79

.          spatgsa rd_int , weights(wts) moran

Measures of global spatial autocorrelation

Weights matrix
--------------------------------------------------------------
Name: wts
Type: Distance-based (inverse distance)
Distance band: 0.0 < d <= 1000.0
Row-standardized: No
--------------------------------------------------------------

Moran's I
--------------------------------------------------------------
Variables |    I      E(I)   sd(I)     z    p-value*
--------------------+-----------------------------------------
rd_int |      .  -0.002   0.003       .       .
--------------------------------------------------------------
*1-tail test

======================

I also tried
spatwmat , name(wts) xcoord(longitude) ycoord(latitude) band(0, 1000)
spatgsa rd_int , weights(wts) geary

and also got nothing:

The following matrix has been created:

1. Inverse distance weights matrix wts
Dimension: 511x511
Distance band: 0 < d <= 1000
Friction parameter: 1
Minimum distance: 0.0
1st quartile distance: 0.5
Median distance: 2.8
3rd quartile distance: 5.4
Maximum distance: 10.5
Largest minimum distance: 2.59
Smallest maximum distance: 5.79

.          spatgsa rd_int , weights(wts) geary

Measures of global spatial autocorrelation

Weights matrix
--------------------------------------------------------------
Name: wts
Type: Distance-based (inverse distance)
Distance band: 0.0 < d <= 1000.0
Row-standardized: No
--------------------------------------------------------------

Geary's c
--------------------------------------------------------------
Variables |    c      E(c)   sd(c)     z    p-value*
--------------------+-----------------------------------------
rd_int |      .   1.000   0.187       .       .
--------------------------------------------------------------
*1-tail test

=====================

I've had the same problem with hundreds of similar data-sets.
Grateful for your help.  In case it would help in debugging, I've

http://www.comp.nus.edu.sg/~ipng/research/moran_working.dta

Many thanks
Ivan Png

--
Skype: ipng00
T: +65 6516 6807
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```

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