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### Parametric Methods I: The Grubb’s Test

- Univariate outlier detection: The Grubb's test (maximum normed residual test) ─ another statistical method under normal distribution
- For each object x in a data set, compute its z-score: x is an outlier if

where

\[ t^{2}_{\alpha/(2N),N-2 } \]

is the value taken by a t-distribution at a significance level of α/(2N), and N is the # of objects in the data set - For each object x in a data set, compute its z-score: x is an outlier if

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