ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #2 (due September 18, 2:00pm)
Not to be turned in:
At this point, it would be a good idea to review the material in Appendix B.4 (if you
havent already).
Written problems:
1.
Su
Homework #2 Problems from Wooldridge
Wooldridge Computer Exercise C2.4
Use the data in WAGE2.RAW (WAGE2.DTA) to estimate a simple regression explaining
monthly salary (wage) in terms of IQ score (IQ). (Additional questions are given on the
assignment shee
ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #3 (due September 25, 2:00pm)
Written problems:
1.
Recall the reverse regression that you ran in Homework Assignment #2. Rather than
the SLR of y on x, you ran a SLR of x on y.
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Homework Assignment #10 (due April 22, 12:00pm)
Written problems:
1.
Wooldridge Problem 10.2
2.
Wooldridge Problem 10.6
Computer problems (show any relevant Stata output):
1.
Woold
ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #5 Solutions
1. (Wooldridge 4.2)
(i) H0: 3 = 0. H1: 3 > 0.
(ii) The proportionate effect on salary is .00024(50) = .012. To obtain the percentage effect, we
multiply this by 100
ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #2 Solutions
Written problems:
1. a.
E ( y ) = E ( 0 + 1 x + u ) = 0 + 1E ( x ) + E ( u ) = 0 + 1E ( x )
b.
cov( x, y ) = cov( x, 0 + 1 x + u ) = cov( x, 0 ) + 1 var( x) + cov(
ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #5 (due October 16, 2:00pm)
Written problems:
1.
Wooldridge:
Chapter 4, Problem 2
2.
Wooldridge:
Chapter 4, Problem 4
In addition to the questions in the book, answer the follow
ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #3 Solutions
Written Problems:
1.
(a) We know that R2 is equal to the square of the correlation between x and y. Since the
correlation between y and x is the same, then the R2 f
ECO 341K
University of Texas
Introduction to Econometrics
In-Class Exam #2 Solutions (Practice)
1.
t-stat = (1.084 1)/0.060 = 0.084/0.060, less than 29,0.05 = 1.699, so do not reject at 10% level.
2.
The t-stat on profmarg is 1.69, very close to the criti
ECO341K Introduction to Econometrics
Chapter 3: The Multiple Regression Model Estimation
Haiqing Xu
University of Texas
Feb 6, 2013
Haiqing Xu (University of Texas)
Multiple Regression Estimation
Feb 6, 2013
1 / 54
Lecture 6 - Outline
Multiple Linear Regr
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Homework Assignment #2 Solutions
Written problems:
1. a.
E ( y ) = E ( 0 + 1 x + u ) = 0 + 1E ( x ) + E (u ) = 0 + 1E ( x )
b.
cov( x, y ) = cov( x, 0 + 1 x + u ) = cov( x, 0 ) + 1
ECO 341K
University of Texas
Introduction to Econometrics
In-Class Exam #2 (Practice)
NAME:
_
There are a total of 35 points on this exam. The exam is closed book. You may only refer
to the exam and the provided cheat sheet and statistical tables. Do not
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Homework Assignment #6 (due Monday, March 18th, 12:00pm)
Written problems:
1.
Wooldridge Problem 4.6
2.
Wooldridge Problem 4.8
3.
Wooldridge Problem 4.10
4.
Suppose that you have a
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Homework Assignment #3 (due February 11th, 12:00pm)
Written problems:
1.
Show that R-squared (for a simple linear regression) is equal to the square of the
correlation between y an
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Sample In-Class Exam #2 Solutions
1. Yes. The p-value (0.013) is less than the level (0.05).
2. 0.3441 +/- t30,0.05 (0.1304) = 0.3441 +/- (1.697) (0.1304) = (0.1288, 0.5654).
3. Th
ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #4 Solutions
3.2 (i) Yes. Because of budget constraints, it makes sense that, the more siblings there are in a
family, the less education any one child in the family has. To fin
Homework #1 Problems from Wooldridge
Wooldridge Problem 1.2
A justification for job training programs is that they improve worker productivity. Suppose that
you are asked to evaluate whether more job training makes workers more productive. However,
rather
ECO 341K
University of Texas
Introduction to Econometrics
In-Class Exam #1 (Practice)
NAME:
_
EID:
_
There are a total of 35 points on this exam. The exam is closed book. You may only refer
to the exam and the provided cheat sheet. Do not spend too much t
Homework #3 Problems from Wooldridge
Wooldridge Problem 2.6
Using data from 1988 for houses sold in Andover, Massachusetts, from Kiel and McClain
(1995), the following equation relates housing price (price) to the distance from a recently built
garbage in
ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #4 (due October 11, 3:30 pm)
Written problems:
1.
Wooldridge Problem 3.2:
The data in WAGE2.RAW on working men was used to estimate the following
equation:
educ 10.36 .094sibs .
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
In-Class Exam #1
NAME:
_
There are a total of 40 points on this exam. The exam is closed book. You may only refer
to the exam and one page of A4 size cheat sheet. Do not spend too
ECO 341K
University of Texas
Introduction to Econometrics
Homework Assignment #6 (due October 23, 2:00pm)
Written problems:
1.
Wooldridge:
Chapter 4, Problem 6
2.
Wooldridge:
Chapter 4, Problem 8
3.
Wooldridge:
Chapter 4, Problem 10
4.
Suppose that you ha
ECO341K Introduction to Econometrics
Chapter 4: The Multiple Regression Model Inference
()
Chapter 4: Inference
1 / 50
Inference I: Lecture 10
Lecture 10 Outline
The Multiple Regression Model Inference I
1. Sampling Distribution of OLS Estimators
2. Testi
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Homework Assignment #9 (due April 17th, 12:00pm)
Written problems:
1.
Wooldridge Problem 8.4
2.
Wooldridge Problem 9.4
3.
Suppose that you had measurement error in the y variable.
ECO 341K (34365)
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Homework Assignment #7 (due April 1st, 12:00pm)
Written problems:
1.
Wooldridge Problem 7.2
2.
Wooldridge Problem 7.8
Computer problems (show any relevant Stata output):
1.
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Homework Assignment #5 (due March 4th, 12:00pm)
Written problems:
1.
Wooldridge Problem 4.2
2.
Wooldridge Problem 4.4; in addition to the questions in the book, answer the
followin
ECO 341K
University of Texas
Introduction to Econometrics
Prof. Haiqing Xu
Homework Assignment #4 (due February 25th, 12:00pm)
Written problems:
1.
Wooldridge Problem 3.2; in addition to the questions in the book, answer the
following:
(iv)
If you drop fe
ECO 341K
Introduction to Econometrics
Some Basic Concepts in Statistics
Random variable:
associated a number with each event in the world
ex: X =number of heads in a sequence of 10 coin tosses
ex: H =height of a person
Each random variable has a proba