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

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