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From |
Ivan Png <iplpng@gmail.com> |

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 uploaded a sample data-set here: http://www.comp.nus.edu.sg/~ipng/research/moran_working.dta Many thanks Ivan Png -- Skype: ipng00 T: +65 6516 6807 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: SPATGSA***From:*Maurizio Pisati <maurizio.pisati@unimib.it>

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