What is "mean deviation"

n. the arithmetic mean of the absolute values of deviations from the mean of a distribution [syn: mean deviation from the mean]

Mean deviation may refer to:

Mean Deviation: Four Decades of Progressive Heavy Metal is a non-fiction book written by former Metal Maniacs magazine editor Jeff Wagner. The book was illustrated by Voivod drummer Michel "Away" Langevin and has a foreword by Porcupine Tree frontman Steven Wilson. Mean Deviation was published in December 2010 by Bazillion Points under supervision of Ian Christe.