QUARTILE DEVIATION By N., Pam M.S. - April 28, 2013 A measure of dispersion. The deviation is described as half the distance between the first and third quartiles. QUARTILE DEVIATION: "The quartile deviation seemed off to the examiner." Related Psychology Terms STANDARD DEVIATION AVERAGE ABSOLUTE DEVIATION SPLIT-HALF RELIABILITY ZENO'S PARADOXES RANGE MEAN DEVIATION MAHALANOBIS I) VARIANCE BOGARDUS SOCIAL DISTANCE SCALE SOCIAL DISTANCE SCALE Cite this page: N., Pam M.S., "QUARTILE DEVIATION," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/quartile-deviation/ (accessed May 18, 2021).