If a single observation is more extreme than either of our outer fences, then it is an outlier, and more particularly referred to as a strong outlier.If our data value is between corresponding inner and outer fences, then this value is a suspected outlier or a weak outlier. The original outlier detection methods were arbitrary but now, principled and systematic techniques are used, drawn from the full gamut of Computer Science and Statistics. This is the simplest, nonparametric outlier detection method in a one dimensional feature space. Outlier detection is the process of detecting and subsequently excluding outliers from a given set of data. By default, we use all these methods during outlier detection, then normalize and combine their results and give every datapoint in the index an outlier score. High-Dimensional Outlier Detection: Specifc methods to handle high dimensional sparse data; In this post we briefly discuss proximity based methods and High-Dimensional Outlier detection methods. Aggarwal comments that the interpretability of an outlier model is critically important. It becomes essential to detect and isolate outliers to apply the corrective treatment. High-Dimensional Outlier Detection: Methods that search subspaces for outliers give the breakdown of distance based measures in higher dimensions (curse of dimensionality). DATABASE SYSTEMS GROUP Statistical Tests • A huge number of different tests are available differing in – Type of data distribution (e.g. The first and the third quartile (Q1, Q3) are calculated. Outlier Detection Techniques For Wireless Sensor Networks: A Survey ¢ 3 (Hawkins 1980): \an outlier is an observation, which deviates so much from other observations as to arouse suspicions that it was generated by a diﬁerent mecha- Here outliers are calculated by means of the IQR (InterQuartile Range). Gaussian) – Number of variables, i.e., dimensions of the data objects Outlier analysis is a data analysis process that involves identifying abnormal observations in a dataset. Mathematically, any observation far removed from the mass of data is classified as an outlier. Figure 2: A Simple Case of Change in Line of Fit with and without Outliers The Various Approaches to Outlier Detection Univariate Approach: A univariate outlier is a … Outliers can now be detected by determining where the observation lies in reference to the inner and outer fences. Four Outlier Detection Techniques Numeric Outlier. 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