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R, the correlation coefficient is a statistical measure which ranges between -1 and 1. There are no hard and fast rules about the strength but, as professional statistician, I used 0.25 and 0.75 as thresholds.

-1 < R < -0.75 : strong negative relation

-0.75 < R < -0.25 : moderate negative relation

-0.25 < R < 0.25 : small; negative or positive as indicated by sign of R

0.25 < R < 0.75 : moderate positive relation

0.75 < R < 1 : strong positive relation.

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Q: How Does R Help You Numerically Describe The Strength And Direction?
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