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definition of w:Spearman's rank correlation coefficient

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	* A '''[[w:scatter plot\|scatter plot]]''', '''scatterplot''', or '''scattergraph''' is a type of [[w:mathematical diagram\|mathematical diagram]] using [[w:Cartesian coordinate system\|Cartesian coordinates]] to display values for two [[w:Variable (mathematics)\|variable]]s for a set of data. ( Wikipedia )		* A '''[[w:scatter plot\|scatter plot]]''', '''scatterplot''', or '''scattergraph''' is a type of [[w:mathematical diagram\|mathematical diagram]] using [[w:Cartesian coordinate system\|Cartesian coordinates]] to display values for two [[w:Variable (mathematics)\|variable]]s for a set of data. ( Wikipedia )

			* '''[[w:Spearman's rank correlation coefficient\|Spearman's rank correlation coefficient]]''' or '''Spearman's rho''', named after [[w:Charles Spearman\|Charles Spearman]] and often denoted by the Greek letter rho is a [[w:non-parametric statistics\|nonparametric]] measure of [[w:correlation and dependence\|statistical dependence]] between two [[w:Variable (mathematics)#Applied statistics\|variables]]. It assesses how well the relationship between two variables can be described using a [[w:monotonic\|monotonic]] function. If there are no repeated data values, a perfect Spearman correlation of +1 or −1 occurs when each of the variables is a perfect monotone function of the other. ( Wikipedia )