Proof

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Regressors: Overview

Left-Out Variables
Definition
Proof

Irrelevant Variables
Definition
Effects
Diagnosis
Treatment

Multicollinearity
Definition
Effects
Diagnosis
Treatment

Pitfalls

Why is using race (or marital status) as a regressor a really bad idea?
What is wrong with highest grade attained (or years in school) as a measure of education?
Should I worry about really small, but significant coefficients?