IQR
A measure of dispersion in statistics, referring to the difference between the third quartile and the first quartile. It is commonly used in box plots and outlier detection.
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The MAD method is more reliable than IQR and the ordinary Z-score on heavy-tailed, contaminated data, because MAD takes the median of the absolute deviations of each observation from the median and is almost insensitive to outliers.
Data Autopsy uses two statistical methods to detect numeric outliers: the interquartile range (IQR) method (using a configurable multiplier of 1.5) and the MAD-based modified Z-score (threshold 3.5).
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The MAD method is more reliable than IQR and the ordinary Z-score on heavy-tailed, contaminated data, because MAD takes the median of the absolute deviations of each observation from the median and is almost insensitive to outliers.
50%UnverifiedData Autopsy uses two statistical methods to detect numeric outliers: the interquartile range (IQR) method (using a configurable multiplier of 1.5) and the MAD-based modified Z-score (threshold 3.5).
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