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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 mean absolute deviation of a set of data is the average distance between each data value and the mean.The mean number of contacts stored and the distance each data value is from the mean is shown below.