Testing for Local Spatial Autocorrelation in the Presence of Global Autocorrelation

A fundamental concern of spatial analysts is to find patterns in spatial data that lead to the identification of spatial autocorrelation or association. Further, they seek to identify peculiarities in the data set that signify that something out of the ordinary has occurred in one or more regions. I...

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Bibliographic Details
Published in:Journal of regional science 2001-08, Vol.41 (3), p.411-432
Main Authors: Ord, J. Keith, Getis, Arthur
Format: Article
Language:English
Subjects:
Bgi / Prodig
Correlation analysis
General methodology
Mathematical models
Spatial data
Statistical and stochastic methods
Studies
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Summary:A fundamental concern of spatial analysts is to find patterns in spatial data that lead to the identification of spatial autocorrelation or association. Further, they seek to identify peculiarities in the data set that signify that something out of the ordinary has occurred in one or more regions. In this paper we provide a statistic that tests for local spatial autocorrelation in the presence of the global autocorrelation that is characteristic of heterogeneous spatial data. After identifying the structure of global autocorrelation, we introduce a new measure that may be used to test for local structure. This new statistic Oi is asymptotically normally distributed and allows for straightforward tests of hypotheses. We provide several numerical examples that illustrate the performance of this statistic and compare it with another measure that does not account for global structure.
ISSN:0022-4146
1467-9787
DOI:10.1111/0022-4146.00224