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Measures of dispersion

Range
Range (intuitively the “width” of the series): R=maxiximinixi.R=\max_i x_i-\min_i x_i. It is sensitive to outliers: one extreme value stretches RR a lot. In parallel one looks at the median and interquartile spread (deeper — in statistics courses).
The range is already shown in the basic statistics widget as RR
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