Solutions to Chapter 11 Practice Problems
1.
This is an example of a binary dependent variable problem with multiple regressors. The variable of interest
here is the grade received in the first principles course. Students may talk about grade-inflating de
Problem Set 1, Econ 120C
Prof. Yixiao Sun
Due on August 17
Part E is required. Please work on any of two parts from Parts A-D, for example, Parts A
and B.
Part A. Multiple Choice
1. Let Y1 ; :; Yn be iid with mean
follows, with the exception of
(a) Y is c
Part C In this exercise we will work with a two-equation model and show that the OLS
estimator is biased. The two equations will be
Y1 20 2Y2 X 1 1
(3)
Y1 5 Y2 3 X 2 2
(4)
Solving these two equations gives (please verify this yourself)
1
1
X 1 2 X 2 (1 2
The Report of the Presidential Commission on the Space Shuttle Challenger Accident in 1986 shows a plot of the
calculated joint temperature in Fahrenheit and the number of O-rings that had some thermal distress.
You collect the data for the seven flights
/*Tutorial 4 - Discrete Choice Models*/
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Problem Set 1, Econ 120C
Prof. Yixiao Sun
April 15, 2014
Question A
1) Correct answer is (b): (b) describes a property of e ciency and not consistency. Consistency means that the estimator becomes closer to the true value when we have a larger sample
size
Econ 120C
Chapter 12 Instrumental variables
1.
Earnings functions, whereby the log of earnings is regressed on years of education, years of on-the-job
training, and individual characteristics, have been studied for a variety of reasons. Some studies have
Econ 120C
Chapter 8 Extra Practice Problems
1.
Females, it is said, make 70 cents to the dollar in the United States. To investigate this phenomenon, you collect data on
weekly earnings from 1,744 individuals, 850 females and 894 males. Next, you calculat
Econ 120C
Chapter 11 Extra Practice Problems
1.
Your task is to model students choice for taking an additional economics course after the first principles course. Describe
how to formulate a model based on data for a large sample of students. Outline seve
Ec 120C ECONOMETRICS C
Foster, UCSD, due Friday of 2nd week
HW #1 MULTIPLE OLS REGRESSION
The Problem
You have the following regression model: REC = 1 + 2 FAM + 3 INC + 4 EDU + 5 VAC, where:
REC = family recreational expenditure ($1000/yr)
FAM = family
Problem Set 4, Econ 120C
Prof. Yixiao Sun
Due on June 5
1. To analyze the eect of a minimum wage increase on employment, a famous study used
a quasi-experiment for two adjacent states: New Jersey and (Eastern) Pennsylvania. On April
1, 1992, the minimum w
Ec 120C ECONOMETRICS C
Foster, UCSD, due Tuesday of 2nd week
HW #1 MULTIPLE OLS REGRESSION
The Problem
You have the following regression model: REC = 1 + 2 FAM + 3 INC + 4 EDU + 5 VAC, where:
REC = family recreational expenditure ($1000/yr)
FAM = family
Econ 120C
Chapter 15 Time Series
1.
Your textbook presents as an example of a distributed lag regression the effect of the weather on the price of
orange juice. The authors mention U.S. income and Australian exports, oil prices and inflation, monetary pol
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Economics 120C
Fall 2014
Dr. Maria Cndido
Student Name:_
Student ID:_
Seat Assignment:_
Economics 120C Midterm Examination Solutions
Fall Quarter
November 13th, 2014
Version A
Instructions:
a.
You have 80 minutes to finish your exam. Write your name and s
Economics 120C
Fall 2013
Dr. Maria Cndido
Student Name:_
Student ID:_
Seat Assignment:_
Economics 120C Midterm Examination Solutions
Fall Quarter
November 8th, 2013
Version A
Instructions:
a.
You have 80 minutes to finish your exam. Write your name and st
Problem Set 3, Econ 120C
Prof. Yixiao Sun
Due on May 22
1. Explain the reasons why you agree or disagree with the following statements.
(a) The J-statistic can always tell us whether the instruments are exogenous or not.
(b) In the presence of endogenous
Brett Helberg
A09200117
11/01/13
1. Homework 1
a) Given a discrimination against minorities and appropriate factors have been controlled for,
the sign of B1 should be positive. (approve/white > 0)
b) The coefficient on white is .2005957.
P(approved | whit
Problem Set 2, Econ 120C
Yixiao Sun
April 29, 2014
Part A. Multiple Choice (Answers are in bold font)
1. In the context of a controlled experiment, consider the simple linear regression formulation
Yi = 0 + 1 Xi + ui . Let the Yi be the outcome, Xi the tr
Problem Set 1 Solutions
Econ 120C / Winter 2008 Due date: January 23, 2008
1
Exercises
The exercises in this problem set are similar to those in Chapter 2 of Stock and Watson. You may benefit by referring to exercises 2.1, 2.12, 2.21 and 2.23 to g
Economics 120C
Winter 2012
Dr. Maria Cndido
Student Name:_
Student ID:_
Name of Student to your right:_
Name of Student to your left: _
Economics 120C Midterm Examination Answer Key
Winter Quarter
February 17th, 2012
Version A
Instructions:
a.
You have 50
Econ 120C
Chapter 10 Panel Data
1.
A study, published in 1993, used U.S. state panel data to investigate the relationship between minimum wages and
employment of teenagers. The sample period was 1977 to 1989 for all 50 states. The author estimated a model
Economics 120C Professor Yongil Jeon Summer 2008-1
Name: _ Student ID#: _
Homework #1 Summer 2008-Session 1, Econ 120C (Midterm Exam, Summer 2007-Session 2, Econ 120C) Answer all questions on separate paper. This problem set should be handed in to
Economics 120C Professor Yongil Jeon Summer 2007-2
Name: _ Student ID#: _
Answer to Homework #1 Summer 2007-Session 2, Econ 120C (Midterm Exam, Summer 2007-Session 1, Econ 120C) Answer all questions on separate paper. This problem set should be ha
Problem Set 3 Solutions
Econ 120c / Winter 2008 Due date: Wednesday, February 13, 2008
1
Exercises
1. Let Y be a binary dependent variable with explanatory variables X1 , X2 , . . . , Xk . (a) Show that E(Y |X1 , X2 , . . . , Xk ) = P r(Y = 1|X1 ,
Econ 120C
Chapter 14 Time Series
1.
You set out to forecast the unemployment rate in the United States (UrateUS), using quarterly data from 1960,
first quarter, to 1999, fourth quarter.
a.
The following table presents the first four autocorrelations for t
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