By correlation, are you referring to the statistical measurement of the relationship between two variables? Wherein, if the correlation is...
-1 = indicates Negative Relation (i.e. stocks move in opposite direction)
0 = indicates No Relation
+1 = indicates Positive Relation (i.e. stocks move in same direction)
In any case, you'll have to clarify how to use this data...(atleast I've not understood it
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Nitesh