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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.
Nigel Clark, engineer. Views. The standard deviation is a calculated value of the square root of the variance which is an accumulation of each paired data set (data point less the mean) which is squared. The value is then divided by the number of data points. By adding a constant A, you adjust the mean by that constant and then subtract it out.