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Average Deviation. In statistics, the absolute deviation of an element of a data set is the absolute difference between that element and a given point. The average deviation of a data set is the average of the absolute deviations. The average deviation is also called the average absolute deviation.
The standard deviation is the square root of the variance. The variance is an average of the squared deviations from the mean: s 2 = (x â x) â 2 n â1, where n is the sample sizeYou are probably wondering why we divide by n â1 in computing the average rather than by n. Here is an explanation.