The trouble with
thinking big..
Machine Learning Basics
Last updated Mar 23, 2026
Section
1.1 What is linear regression?
Notes
Linear Regression
Linear regression models the relationship between inputs and outputs with a best-fit line.
It is one of the simplest ways to understand prediction, trend lines, and how machine learning fits patterns from data.
What you learn
- How slope and intercept define the line
- Why residuals measure prediction error
- How the model chooses a line that minimizes overall loss
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