Statistics › Section L · Linear regression and correlation › Topic L.3
The least-squares regression line
A scatterplot shows the relationship; a regression line summarises it into a prediction machine. The least-squares line is the one that misses the data least - and its slope and intercept carry the story in usable units.
In this topic
- From scatter to line
- Least squares: the criterion
- The formulas
- Worked example: the house-price line
- Worked example: using and misusing the line
- Interpreting slope and intercept
- Regression toward the mean
- Regression is not symmetric
- Common mistakes to avoid
- Key takeaways
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