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education/statistics/Correlation and Regression.md
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@ -29,7 +29,9 @@ Correlation is between `-1` and `1`. Correlation near 1 means tight clustering,
Put the $x$ values into $L1$, put the $y$ values into $L2$. Put the $x$ values into $L1$, put the $y$ values into $L2$.
1. Convert the $x$ values to standard units ($z$). Convert the $y$ values to standard units. 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. $$ z = \frac{x-\bar{x}}{\sigma_x} $$
2. Multiply the standard units for each ($x$, $y$) pair in the sets
$$ x * y = $$
3. Find the average of the values from step 3, this is $r$. 3. Find the average of the values from step 3, this is $r$.
$$ z_x = \frac{L_1-\bar{x}}{\sigma_x} $$ $$ z_x = \frac{L_1-\bar{x}}{\sigma_x} $$
https://www.thoughtco.com/how-to-calculate-the-correlation-coefficient-3126228 https://www.thoughtco.com/how-to-calculate-the-correlation-coefficient-3126228