Lesson 6
What is the error term?
Big question
Why does regression include a term for what the model does not explain?
Lesson progress
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Big question
Concept
Activity
Quiz
Learning objectives
- Explain what is the error term? in plain language.
- Use the main concept correctly.
- Connect the lesson idea to a formula, graph, Python result, or real example.
Simple explanation
Why does regression include a term for what the model does not explain?
Key terms
Example
Why does regression include a term for what the model does not explain?
Python walkthrough
Interactive activity
Education and wage
Each dot is one observation. The fitted line summarizes the relationship between Education and Wage.
Slope: 2.33
Intercept: -10.10
R-squared: 0.949
Causality decision
A wage regression has a positive education coefficient. Can we interpret it as causal?
Try it yourself
Write one plain-English sentence explaining the main idea from this lesson.
Common mistakes
Check these before you move on.
The error term is part of the model. It represents unobserved influences, not a Python mistake.
Quick quiz
What is the main idea of What is the error term??
Key takeaway
Use this lesson idea in a cautious, evidence-based regression interpretation.