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education/statistics/Correlation and Regression.md
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@ -28,7 +28,11 @@ Correlation is between `-1` and `1`. Correlation near 1 means tight clustering,
## Calculating $r$ by hand
Put the $x$ values into $L1$, put the $y$ values into $L2$.
Convert the $x$ values to standard units. Convert the $y$ values to standard units. Multiply the standard units for each x y pair. Find the average of the values from step 3, this is $r$.
1. Convert the $x$ values to standard units ($z$). Convert the $y$ values to standard units.
2. Multiply the standard units for each ($x$, $y$) pair.
3. Find the average of the values from step 3, this is $r$.
$$ z_x = \frac{L_1-\bar{x}}{\sigma_x} $$
https://www.thoughtco.com/how-to-calculate-the-correlation-coefficient-3126228
# Terminology
| Term | Definition |