Homework 2
Economics 120C
Due Wednesday, Nov 21st, 2012 at 5:30 pm
All the files mentioned in this homework are available on TED.
For this homework, you have to turn in a small ANSWER SHEET and a LOG FILE.
(1) Write your answers in an answer sheet. Some q
Econ 172A, Fall 2007: Problem Set 1 Instructions: Due: October 30, 2007, in class (no late papers). Please supply complete answers. Unless otherwise noted on homework assignments and on examinations, you are required to explain how you got your answer. Si
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
PS1_1F2007
c1 obj. funct. x1 variables 3 1
c2 -2 x2 0 left hand side 3 -3 b 3 1
technology
1 -1
1 1
value
3 This is the basic template (adjusted for a two-variable problem. Solution to 1b(iii) shown (if you look at solver you can see the constraints - in
Econ 172A, Fall 2007: Problem Set 2 Instructions: examination.) Due: Never. (This problem set covers material that is fair game for the midterm
1. The associated excel spread sheet contains three pages. One contains a linear programming template with a sp
Econ 172A, Fall 2007: Problem Set 2, Suggested Answers 1. See excel spreadsheet. The numerical answers are there, but you should make sure that you can explain how to get them. 2. The proposed change is like changing the right hand side of a constraint. T
Econ 172A, Fall 2007: Problem Set 3 Instructions: Due: December 4, 2007.
1. Consider the knapsack problem in which there are six items with weights wi = 10i for i = 1, . . . , 6 (that is, the weights are 10, 20, 30, 40, 50, and 60) and values vi = (9 + i)
Problem 1_a_
1 2 3 4 5 6 7 8 9 10 11 12 13 14
A Econ 172A Joel Sobel
B
C
D
E PROBLEM 1
F
G
H
I
J
K
L
M
Objective Function Coefficients 10 Variables 0 0 0.33 1 1 0 22 36 52 70 90
Resource Constraints Value 134
ai1 10
ai2 20
ai3 30
ai4 40
ai5 50
ai6 60
100
Econ 172A, Fall 2007: Problem Set 3, Suggested Answers 1. (a) I solved the problem with the constaints that the variables must be between 0 and 1, but not necessarily integers. I obtained the value 146 (carry item 6 and .8 item 5). (I attached the spreads
Econ 172A, Fall 2008: Final Examination Version A Instructions. 1. The examination has seven questions. Answer them all. 2. If you do not know how to interpret a question, then ask me. 3. Questions 1-5 require you to provide numerical answers. You must ex
Econ 172A, Fall 2008: Final Examination
1. Suppose a salesperson is located at Node 0 in the graph on the next page.
Find the shortest route to each of the other locations. Be sure to explain
how you arrived at your answers and why your method works. [Sho
Econ 172A, Fall 2008: Problem Set 1 Instructions: Due: October 23, 2008, in class (no late papers). Please supply complete answers. Unless otherwise noted on homework assignments and on examinations, you are required to explain how you got your answer. Si
Econ 172A, Fall 2008: Problem Set 1, Possible Solutions
Comments: Ten points were possible. Students who provided no evidence of using Excel received
at most six points.
1. (a) Here is a picture. (The feasible set is the gure and its interior.)
2,2
d
d
PS1_1
c1 obj. funct. x1 variables 4 1
c2 -2 x2 0 left hand side 4 -4 b 4 2
technology
1 -1
1 2
value
4 This is the basic template (adjusted for a two-variable problem. Solution to 1b(iii) shown (if you look at solver you can see the constraints - in parti
Econ 172A, Fall 2008: Problem Set 2 Instructions: Due: November 13, 2008, in class (no late papers).
1. This is formulation problem that appeared on the midterm (with a few minor changes). A local company can produce three products, A, B, and C. The compa
Econ 172A, Fall 2007: Problem Set 1 1. (a) Here is a picture. (The feasible set is the gure and its interior.)
1,2 d d d 0,1 d d 0,0 (b) i. ii. iii. iv. d 3,0
x = (3, 0), value = 3. x = segment connecting (3, 0) to (1, 2), value = 3. x = (3, 0), value = 3
Econ 172A, Fall 2007: Midterm Solutions and Grading Notes What follows are the approximate rules used to assign points. 1. 21 points total (a) 4 points: 1 point for writing a dual with the correct number of variables and constraints; 1 point for objective
University of California, San Diego
Department of Economics
Economics 120C Econometrics
Fall 2012
Tu Th 2:00 3:20 pm, Warren Lecture Hall 2001
Instructor
Maria Teresa Cndido
Office: 110A Economics
Office Phone #: 534-2518
Office Hours: Tu Th 9:15 am 10:30
Template
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
A Econ 172A Joel Sobel
B
C
D
E LP TEMPLATE c1
F
G
H
I
J
K
L
M
Objective Function Coefficients
c2
c3
c4
Variables
x1
x2
x3
x4 Put guesses for variables in E8 through H8
Resource Constraints
Econ 120C
Instrumental Variables
Instrumental Variables
General Idea
Yi = 0 + 1 Xi + ui
When Xi and ui are correlated, the estimated 1 will
reflect the influence not only of X but also of u. The
estimator of 1 will be biased and not consistent
IV regress
Template
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
A Econ 172A Joel Sobel
B
C
D
E LP TEMPLATE c1
F
G
H
I
J
K
L
M
Objective Function Coefficients
c2
c3
c4
Variables
x1
x2
x3
x4 Put guesses for variables in E8 through H8
Resource Constraints
Econ 120C
Panel Data
Panel Data
Panel Data data for n different entities observed at T
different time periods.
In a panel data set, we follow the same individuals,
families, firms, cities, states, etc, across time.
Notation: (Xit, Yit) where i represents
Econ 172A, Fall 2004: Final Examination (I) Instructions. 1. The examination has ve questions. Answer them all. 2. If you do not know how to interpret a question, then ask me. 3. You must justify your answers to each question. 4. The table below indicates
Econ 172A, Fall 2007: Final Examination (I) Instructions. 1. The examination has seven questions. Answer them all. 2. If you do not know how to interpret a question, then ask me. 3. Questions 1-6 require you to provide numerical answers. You must explain
Econ 172A, Fall 2007: Final Examination Answers Final median: 110, high: 146, low: 35. Most people did well on 1, 2, 4, and 6. Some lost points on 1 and 2 for misusing the class algorithm or failing to justify an ad hoc procedure. We deducted points on th
Econ 172A, Fall 2007: Midterm A Instructions The examination has 5 questions. Answer them all. You must justify your answers to Questions 1, 2, and 5. (if you are not certain what constitutes adequate justication, please ask.) No justication is needed for