87 Comparison of R squared with adjusted R squared

This video explores a crucial concept in econometrics: the relationship between R-squared and adjusted R-squared. We'll explain what happens when R-squared increases while adjusted R-squared decreases, and what this discrepancy reveals about your regression model. Learn why adding irrelevant variables can inflate R-squared but diminish adjusted R-squared, signaling that the new variables don't significantly improve the model's explanatory power. Understand that adjusted R-squared prompts a stricter question about whether new variables justify the use of degrees of freedom, especially when considering groups of variables together. Discover how this difference hints at the importance of joint hypothesis testing, even though the F-test formally confirms it. Subscribe to @AxiomTutoringCourses for more econometrics insights.