Definitions for rank-difference correlation
rank-order correlation coefficient, rank-order correlation, rank-difference correlation coefficient, rank-difference correlation(noun)
the most commonly used method of computing a correlation coefficient between the ranks of scores on two variables
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"rank-difference correlation." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/rank-difference correlation>.