An elbow in how sorted GLOSH scores change across density settings selects a near-best minpts, and a regression-adjusted knee in the score list sets the inlier/outlier threshold, with no labels required.
On the evaluation of outlier detection and one-class classification: a comparative study of algorithms, model selection, and ensembles,
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Unsupervised Parameter-free Outlier Detection using HDBSCAN* Outlier Profiles
An elbow in how sorted GLOSH scores change across density settings selects a near-best minpts, and a regression-adjusted knee in the score list sets the inlier/outlier threshold, with no labels required.