University of California
Department of Economics
D. Steigerwald
Economics 140A
Exercise 1
1.
You are interested in purchasing a home in Santa Barbara. To determine if it is a good
time to buy, you collect the selling prices of all homes in the city over t
Economics 140A
Fall 2011
Professor Startz
Answers to Homework 2
1.
a)
b)
c)
.
2.
a)
b)
c)
d)
3.
a) The sample mean is
. The sample median is the value in the middle, 2.0. The
sample variance is
4. Since the data is normal, so is the mean. Since the no
Economics 140A
Spring 2015
Homework 1
Your first job is to predict the stock market, specifically the Dow Jones Industrial Average (DJIA).
Go look up the two most recent DJIA and write them down.
Here is the data for 15 consecutive trading days in March 2
Economics 140A
Spring 2015
Homework 3
Note: In this assignment, CPS data refers to the file cps_march_2014.wf1
1. Use the data set cdcosts2015 to estimate the marginal cost of one more CD. (Regress costs
on the number of CDS.) Test the hypothesis that the
Economics 140A
Answers to Exercise 1
1. (From Fall 1992 nal examination.)
a) To assess the quality of estimates obtained from the actual sales prices
of homes, we must determine the statistical properties of the estimators from
which the estimates are con
Economics 140A
Fall 2011
Professor Startz
Sketched Answers to Homework 3
1. Your profit function is
(
)
(
(
) (
)
(
(
2. We have
(
(
From earlier results, we know
( )
(
)
(
)
)
(
(
.
(
)
(
)
)
(*( )
)
)
Write an alternative estimator, , as a linear functi
University of California
Department of Economics
D. Steigerwald
Economics 140A
Exercise 3
1.
Consider the model
Yt = Xt + Ut, t = 1,2,.,n,
where Xt is the period-t value of an exogenous variable with mean zero, is an unknown
parameter, the period-t error
Economics 140A
Spring 2015
Homework 2
1.
Suppose you are given a data sample of three independent observations. The three
values are cfw_3,5,4. For this question, show how youre doing the calculations rather than
use a computer.
What is the sample mean?
Problem Set 1
Economics 140A
August 10, 2016
1. Since we assume that cfw_Pt 497
t=1 are i.i.d, let us suppose from now on that the mean E(Pt ) = and
V ar(Pt ) = 2 .
(a) An estimator for the mean is P =
denotes the j-th order statistics.
1
497
P497
t=1 Pt
Economics 140A
Winter 2014
Stearns and Wright
Homework 3
1. The variance of the OLS estimator is var = 2 if our usual assumptions hold. Suppose
2
2.
that = + 5 + 2 and = + 5, so is biased but all of our other assumptions
hold. What is var ?
a. Find the
Economics 241B
Answers to Exercise 7
1.
(Final Examination, Economics 241B, Winter 2004)
a.
For the classic linear regression model, identication of
mulitiplying both sides of the regression by Xt :
1
follows from
Xt Yt = Xt2 + Xt Ut :
Taking the expectat
Economics 140A
Fall 2011
Professor Startz
Homework 2
You may find the lecture notes Review of Statistics and Chapter R of the text helpful.
1.
The random variable x can only take three possible values: 1 with prob=0.3, 2 with
prob=0.3 and 3 with prob=0.4.
Economics 140A
Answers to Exercise 5
2. (Fall 1990 Final Examination)
a) The rst graph, which corresponds to (1), reveals a linear relation between
Qt and P Mt . We assume that 3 > 0 as movie theater tickets are likely substitutes
@Qt
for video cassette r
Economics 140A
Winter 2014
Fischer/Stearns/Wright
Homework 4
Use our CPS data for this homework.
Consider the regression
= 0 + 1 + 2 + 3 2 + 4 + 5 + 6
+ 7 + 8 + 9
1. Give point estimates for salaries for the following (you might want to use Excel to sa
5021-1-1
FBE 555 Midterm Exam
Midterm Exam
Please do not open this exam until you are told to do so.
Instructions:
A. You may complete this exam with a blue or black pen or a sharp pencil.
B. There are 8 questions in this exam.
C. There are 110 points pos
Problem Set 4
Economics 140A
September 4, 2016
1. (a) 0 is the expected income for noncollege graduate and 1 is the difference between expected income for
college graduates and noncollege graduates.
(b) Y N G = 0 , Y G Y N G = 1 .
(c) 0 is the expected in
University of California
Department of Economics
Doug Steigerwald
Introduction to Econometrics
Economics 140A
Course Prerequisites:
Students should be familiar with calculus (Mathematics 3A-3C), the fundamentals of
statistical inference (Statistics 120A)
Economics 140A
Winter 2014
Sketched Out Answers for Quiz 1
Note that not all the details are shown here. The sketches here are just to point you in the right
direction. A good exam answer would have more details.
Question: Let:
X ~ N(0,4)
(a) Find ().
Y =
6003-1-1
FBE 555 Midterm Exam
Midterm Exam
Please do not open this exam until you are told to do so.
Instructions:
A. You may complete this exam with a blue or black pen or a sharp pencil.
B. There are 6 questions in this exam.
C. There are 100 points pos
Economics 140A
Answers to Exercise 3
1. (Fall 1995 Final Examination)
a) The OLS estimator of is
Pn
Xt Yt
t
B = P=1
n
2=
t=1 Xt
Pn
Xt Ut
t
+ P=1
n
2:
t=1 Xt
Because Xt is exogenous and EUt = 0,
Pn
t=1 Xt EUt
EB = + Pn
=:
2
t=1 Xt
The variance of the OLS e
Economics 140A
Fall 2011
Professor Startz
Homework 5
1. Consider the regression
for the first
.
. There are
observations, while
()
observations and
for the last
()
a. Derive the variance of . (You may use the formula for OLS variance under
heteroskedastic
University of California
Department of Economics
D. Steigerwald
Economics 140A
Exercise 4
1.
You are asked to determine the effects of various qualities on a persons level of income.
Specifically, these qualities are sex and level of educational achieveme
Economics 140A
Winter 2014
Wright/Stearns
Homework 5
2
1. Consider the regression = + . There are = 1 + 2 observations and ( ) = 1
2
for the first = 1,2, , 1 observations, while ( ) = 2 for the last = 1 + 1, 1 +
2, , 1 + 2 .
a. Derive the variance of . (Y
Economics 140A
Spring 2015
Quiz 1
Answer all 4 questions. Each question is worth 15 points, although some questions are easier
than others. Be sure to show your work for each question.
Write your answers on the pages provided separately from the test book
University of California
Department of Economics
D. Steigerwald
Economics 140A
Exercise 1
1.
You are interested in purchasing a home in Santa Barbara. To determine if it is a good
time to buy, you collect the selling prices of all homes in the city over t
Economics 140A
Fall 2011
Professor Startz
Sketched Answers to Homework 5
1.
a. The formula for the OLS variance under heteroskedasticity is
(
( )
)
In this case thats just
( )
(
)
b. The GLS estimator requires dividing each observation by its correspondin
Project 3
Jasmine Alston, Raymond Mak, Jiayan He
In this project, we try to determine the effect of having children on labor supply. To
determine our dependent variable (hours: average number of hours worked per week), we
include anychild, male, anychild*
Project 2
Jiayan He, Jasmine Alston, Raymond Mak
Samantha our friend who lives in the West and just graduated from UCSB, is thinking about
quitting her job to take a year off for education, and the returning to the same employer. She currently
has three y
Economics 140A: Project 1
Jiayan He, Raymond Mak, Jasmine Alston
To help The USC University Hospital open an ED, we opened the data and analyzed it to
determine how much it would cost to run ED visits of lower extremity. We have 37 observations
to help us
Summary 3 Weiwei Wu
Global Studies 2
Monday 7~7:50pm
Scott Larson
The introduction part of chapter 5 states that South Asia has been at the
crossroads of civilization over the centuries. Along the history, the
religious cultures of South and Central Asia,
Summary 1 Wewei Wu
The preface and the introduction give us the basic concept of
global studies, which is the analysis of events, activities, ideas, processes,
and flows that are transnational or that could affect all areas of the world.
Furthermore, the