Download - Eco 205: Econometrics
1
Regression with a Single Regressor: Hypothesis Tests and Confidence Intervals(SW Chapter 5)
2
Hypothesis Testing and the Standard Error of
3
Hypothesis Testing
4
Formula for SE( )
5
4 ways to conduct Hypothesis Tests
6
Example: Wage vs. Age
7
Example: Wage vs. Age
8
Regression when X is Binary
9
Interpretation when X is binary
10
11
12
13
14
Heteroskedasticity and Homoskedasticity
15
Homoskedasticity
16
Heteroskedasticity
17
Comparison of Group Means
18
Example from the Current Population Survey
19
The class size data
20
So far we have (without saying so) assumed that u might be heteroskedastic.
21
What if the errors are in fact homoskedastic?
22
23
Two formulas for the se( )
24
Robust standard errors in STATA
25
Further Questions
26
The Extended LS Assumptions
27
Efficiency of OLS
28
t-critical values