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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.
Calculating the Average Deviation. 1  1. Find the mean of the data. The average deviation is a more detailed measure of the precision of a group of measurements or experiment values. 2  2. Calculate the absolute deviation of each value from the mean. For this calculation of precision, you need to determine how close each value is to the mean. To do this, subtract the mean from each number. For this measurement, it does not matter whether the value is above or below the mean.