9 CEF vs OLS

Lydia discusses econometric fundamentals, connecting Conditional Expectation Function (CEF) and Ordinary Least Squares (OLS). She explains CEF as the 'truth', OLS as its best linear approximation, demonstrating visually with non-linear data. Lydia emphasizes OLS's role in predicting Y from X, despite unknown CEF shapes. She concludes by likening econometrics to Batman, CEF to Batcave, law of iterated expectation to Alfred, and OLS to the batmobile. Subscribe to @AxiomTutoring for more insights.