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On normalization and algorithm selection for unsupervised outlier detection
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On normalization and algorithm selection for unsupervised outlier detection
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Journal Article
On normalization and algorithm selection for unsupervised outlier detection
2020
Overview
This paper demonstrates that the performance of various outlier detection methods is sensitive to both the characteristics of the dataset, and the data normalization scheme employed. To understand these dependencies, we formally prove that normalization affects the nearest neighbor structure, and density of the dataset; hence, affecting which observations could be considered outliers. Then, we perform an instance space analysis of combinations of normalization and detection methods. Such analysis enables the visualization of the strengths and weaknesses of these combinations. Moreover, we gain insights into which method combination might obtain the best performance for a given dataset.
Publisher
Springer Nature B.V
Subject
