Math — Detecting Outliers
Z-score and interquartile-range rules.
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z = \frac{x - \bar{x}}{\sigma}
|z| > 3 \Rightarrow \text{possible outlier}
x < Q_1 - 1.5\,IQR
\text{or } x > Q_3 + 1.5\,IQR
Z-score and interquartile-range rules.
z = \frac{x - \bar{x}}{\sigma}
|z| > 3 \Rightarrow \text{possible outlier}
x < Q_1 - 1.5\,IQR
\text{or } x > Q_3 + 1.5\,IQR