SpearmanRankCorrelation
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Function Description
Returns the Spearman
rank correlation coefficient 
 between two series, 
 and 
.
 
The Spearman rank correlation coefficient is calculated as:
 

 
where 
 are the ranks of the
values in the series 
, i.e. 
 is the largest value
in the series 
, 
 is the mean of the 
 etc.
 
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