# Grubbs, Dixon, and Generalized ESD: Turning Outlier Detection into a Hypothesis Test

> Source: https://sukruyusufkaya.com/en/learn/anomali-tespiti/grubbs-dixon-esd-testleri
> Updated: 2026-05-13T13:04:48.746Z
> Category: Anomali Tespiti
> Module: Module 2: Statistical Foundations
**TLDR:** Classical statistical hypothesis tests for outlier detection: Grubbs test (single outlier), Dixon Q-test (small samples), Generalized ESD (multiple outliers) — p-values, formulas, scipy implementation, and when to use which.