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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.
Mean absolute deviation (MAD): It is the mean/average of absolute deviations of data point from mean as suggested by name i.e. we subtract the mean from each data point; take it's absolute value (non-negative); sum it up and divide by the number of observations.