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education/statistics/Correlation and Regression.md
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@ -51,4 +51,6 @@ https://www.thoughtco.com/how-to-calculate-the-correlation-coefficient-3126228
- $r$ does not change if you:
- switch the $x$ and $y$ values
- add the same number to every x or y value
- multiply each $x$ or $y$ value by a positive number
- multiply each $x$ or $y$ value by a positive number
- The correlation coefficient can be misleading in the presence of outliers or nonlinear association.
- $r$ only shows the strength of a linear relationship.