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2024-01-03 14:15:35 -07:00
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education/statistics/Correlation and Regression.md
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@ -108,6 +108,8 @@ $$ intercept = \bar{y} - slope*\bar{x} $$
$$ slope = \frac{r * \sigma_y}{\sigma_x} $$
- Interpreting slope: *slope(num)* is the approximate amount the *y context* will *increase/decrease* with each increase in *x label*.
- Interpret the intercept: When the *x context = 0*, the *y context* will be approximately *intercept*.
#### Residual plots
A plot of the differences from the line. Makes it easier to see if the data is football shaped.
If a residual plot has a strong pattern, it may not be suitable for making predictions.