Introduction :
Correlation is a statistical measure that indicates the extent to which two or more variables fluctuate together. Positive Correlation indicates the extent to which those variable increase or decrease in parallel; Negative Correlation indicates the extent to which one variable increases as the other decreases.

https://medium.com/illumination-curated/correlation-and-regression-a-case-study-in-r-d6c3296dfc8e

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