Matching Pairs Correlation coefficientOnline version Correlation coefficient by Martin Edwards 1 Weak negative correlation 2 No correlation 3 Moderate positive correlation 4 Strong negative correlation 5 Perfect negative correlation 6 Perfect positive correlation 7 Weak positive correlation 8 Strong positive correlation 9 Moderate negative correlation 0.25 < r < 0.75 -0.75 < r < -0.25 r = -1 0.75 < r < 1 -1 < r < -0.75 -0.25 < r < 0 0 < r < 0.25 r = 1 r = 0
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