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Eco 205: Econometrics

Eco 205: Econometrics. Any questions ? Turn in GH #2 GH #3 due next Tue in class RAP intro For Thursday, read Chapter 6 and for next Tue Ziliak & McCloskey (2004), “ Size Matters ” J. Socio-economics.

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Eco 205: Econometrics

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  1. Eco 205: Econometrics • Any questions? • Turn in GH #2 • GH #3 due next Tue in class • RAP intro • For Thursday, read Chapter 6 and for next Tue Ziliak & McCloskey (2004), “Size Matters”J. Socio-economics

  2. Regression with a Single Regressor: Hypothesis Tests and Confidence Intervals(SW Chapter 5)

  3. Hypothesis Testing and the Standard Error of

  4. Hypothesis Testing

  5. Formula for SE( )

  6. 4 ways to conduct Hypothesis Tests

  7. Example: Wage vs. Age

  8. Example: Wage vs. Age

  9. Regression when X is Binary

  10. Interpretation when X is binary

  11. Heteroskedasticity and Homoskedasticity

  12. Homoskedasticity

  13. Heteroskedasticity

  14. Comparison of Group Means

  15. Example from the Current Population Survey

  16. The class size data

  17. So far we have (without saying so) assumed that u might be heteroskedastic.

  18. What if the errors are in fact homoskedastic?

  19. Two formulas for the se( )

  20. Robust standard errors in STATA

  21. Further Questions

  22. The Extended LS Assumptions

  23. Efficiency of OLS

  24. t-critical values

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