Average Absolute Deviation

By Kardi Teknomo, PhD.

Average Absolute Deviation is summation of the absolute value of each deviation. It is useful to measure the spread of data while considering the effect of total number of data

Other name: average absolute error

Formula:

Example:

Special for only two positive numbers and , we have

Average Absolute deviation

Variance

 

If , then variance and average absolute deviation which go to zero: ,

If , then

If , then

If , then

Example

, , then

 

See also: Variance, Mean and Average

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Teknomo, Kardi. Mean and Average. http:\\people.revoledu.com\kardi\ tutorial\BasicMath\Average\