See also the following links:

▎ENGLISH

Anomaly Detection Histogram-based Outlier Score
▸ https://nandhini-aitec.medium.com/day-22-anomaly-detection-histogram-based-outlier-score-pyod-pycaret-85c485bc0a3

Histogram-based Outlier Score
▸ http://unsupervisedpapers.com/method/histogram-based-outlier-score/

▎日 本 語

ヒストグラムベースの異常検知アルゴリズムHBOSとは何か
▸ https://www.scutum.jp/information/waf_tech_blog/2018/03/waf-blog-055.html