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Programming Tips 14

How to analyze the correlation coefficient (r)?

The correlation coefficient is always between -1 and 1. 

The closer it is to 1 or -1, the stronger the correlation.

Below are some examples of the different correlation coefficient.
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Positive Correlation

Strong Correlation
(0.7 < r ≤ 1.0)

Moderate Correlation
(0.3 < r ≤ 0.7)

Weak Correlation
(0 < r ≤ 0.3)

Negative Correlation

Strong Correlation
(-1.0 < r ≤ -0.7)

Moderate Correlation
(-0.7 < r ≤ -0.3)

Weak Correlation
(-0.3 < r ≤ 0)