Question: 3. Why dont statisticians use the deviation scores themselves, make all deviations positive, and just use their average? In fact, the average of the deviation

3. Why don’t statisticians use the deviation scores themselves, make all deviations positive, and just use their average? In fact, the average of the deviation scores

(treating all deviations as positive) has a formal name—the average deviation or mean deviation. This procedure was actually used in the past, and some psychologists have noted subtle advantages of the average deviation (Catanzaro &

Taylor, 1996). However, the average deviation does not work out very well as part of more complicated statistical procedures.

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