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Level 9
· ◆◆◆ · ~13 min
Omitted Variable Bias
Omitted Variable Bias
"The central danger of empirical work: leave out a variable that matters and correlates with your regressor, and your slope lies — in a direction you can predict."
omitted variable biasthe bias formula bias = β₂·δ₁sign of the biasOVB as endogeneity, E(u|x) ≠ 0
A short lesson, then a quiz. ❤️×3 — a wrong answer costs a heart; finish with at least one left and the level is yours. Lose all three and you'll have to try again. Replay any time — XP and cleared levels are never lost.