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education/statistics/Correlation and Regression.md
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@ -43,4 +43,12 @@ https://www.thoughtco.com/how-to-calculate-the-correlation-coefficient-3126228
| $r$ | Correlation Coefficient | | $r$ | Correlation Coefficient |
| Linear Correlation | Measures the strength of a line | | Linear Correlation | Measures the strength of a line |
(Chapter 9, ST) (Chapter 9, STAT 1040)
# Correlation contd.
## Notes
- $r$ is a pure number, and does not have units
- $r$ 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