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Testing for Local Spatial Autocorrelation in the Presence of Global Autocorrelation
Author(s) -
Ord J. Keith,
Getis Arthur
Publication year - 2001
Publication title -
journal of regional science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.171
H-Index - 79
eISSN - 1467-9787
pISSN - 0022-4146
DOI - 10.1111/0022-4146.00224
Subject(s) - spatial analysis , autocorrelation , statistic , measure (data warehouse) , statistics , identification (biology) , autocorrelation technique , mathematics , econometrics , test statistic , statistical hypothesis testing , computer science , data mining , botany , biology
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.