See also the following links:

▎ENGLISH

Anomaly Detection
▸ https://avinetworks.com/glossary/anomaly-detection/

How to Find Outliers | 4 Ways with Examples & Explanation
▸ https://www.scribbr.com/statistics/outliers/

▎日 本 語

外れ値
▸ https://bellcurve.jp/statistics/course/12929.html

異常検知 - Wikipedia
▸ https://ja.wikipedia.org/wiki/%E7%95%B0%E5%B8%B8%E6%A4%9C%E7%9F%A5