Graham. Correlation is simply the Pearson r. It's a measure of covaration, which ranges from -1 to 1. The absolute value of r indexes the degree to which you can predict the value of array 2 given knowledge of the value of array 1. If values of array 1 and array 2 tend to move in the same direction then r > 0. If values of array 1 and array 2 tend to move in opposite directions then r < 0. r = 0 means the arrays are independent so no prediction is possible. r = 1 or r = -1 indicate perfect prediction. Maybe this will help?
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