The average absolute deviation of a data set is the average of the absolute deviations of its values from a central point, and is a summary statistic of statistical dispersion or variability. The central point can be a mean, a median, a mode, or another measure of central tendency, and the average absolute deviation is a general form that includes both the mean absolute deviation and the median absolute deviation as special cases.
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1. Average Absolute Deviation (Wikipedia)
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The average absolute deviation (AAD) of a data set is the average of the absolute deviations from a central point.
In Branch: Probability and Statistics, Lead paragraph
It is a summary statistic of statistical dispersion or variability.
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