ABNORMAL VALUE DETECTION DEVICE AND OPERATION METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To prevent a density-based abnormal value in the case where the same value frequently appears from being infinity.SOLUTION: An LOF (local outlier factor) calculation device 1 comprises: a sample set converter 11 which accepts input of a set C of samples having an n-dimensional (n is 1 or larger) sample value and converts the set C into a set D by giving each sample a sample value unique to the sample (a sample value t in illustration in Fig. 2), that is, the set D of a sample having a (n+1)-dimensional sample value; and an LOF calculation unit 12 which accepts input of the set D and an integer k and calculates an LOF.SELECTED DRAWING: Figure 3