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A novel spatial outlier detection technique
Singh Alok Kumar
Lalitha S
Communications in Statistics - Theory and Methods, 2018, 47(1): 247-257.
Summary
Spatial outliers are spatially referenced objects whose non spatial attribute values are significantly different from the corresponding values in their spatial neighborhoods. In other words, a spatial outlier is a local instability or an extreme observation that deviates significantly in its spatial neighborhood, but possibly not be in the entire dataset. In this article, we have proposed a novel spatial outlier detection algorithm, location quotient (LQ) for multiple attributes spatial datasets, and compared its performance with the well-known mean and median algorithms for multiple attributes spatial datasets, in the literature. In particular, we have applied the mean, median, and LQ algorithms on a real dataset and on simulated spatial datasets of 13 different sizes to compare their performances. In addition, we have calculated area under the curve values in all the cases, which shows that our proposed algorithm is more powerful than the mean and median algorithms in almost all the considered cases and also plotted receiver operating characteristic curves in some cases.
Keywords
Area under the curve (AUC); Location quotient (LQ); Receiver operating characteristic (ROC) curve; Spatial autoregressive (SAR) model; Spatial outlier
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