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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.
Both standard deviation and mean deviation are measures of variation (spread from a central value like mean) in data. 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.