Econ 140 - Spring 2016
Section 4
GSI: Fenella Carpena
February 11, 2016
1
Population Regression vs. Sample Regression, Ordinary Least
Squares (OLS) Estimation
Exercise 1.1. (Stock & Watson, Review the Concepts 4.1) Explain the difference between b1 and 1

Econ 140 - Spring 2016
Section 5
GSI: Fenella Carpena
February 18, 2016
1
Hypothesis Testing for Regression Coefficients
Exercise 1.1. (Adapted from Stock & Watson, Exercise 5.1) Suppose that a researcher, using data on
class size (CS) and average test sc

1. This problem will create a dataset by having Stata generated variables in the same
way as we did in PS2. A main advantage of such an exercise is that we can control the
true data generating process (DGP), which is not possible in practical econometric

Department of Economics
University of California
Spring 2016
Prof. Woroch
Economics 140: PS2 Answer Sheet
1. This question does not use real-world data but, as we did in PS1, creates a synthetic dataset using
random number generation commands in Stata. Th

Department of Economics
University of California
Spring 2016
Prof. Woroch
Economics 140:
FIRST MIDTERM ANSWER SHEET
NOTE: There were several versions of the midterm that differed slightly in the numbers that appeared
in a couple of the questions. The ques

Department of Economics
University of California
Spring 2016
Prof. Woroch
Economics 140
Midterm #1 Frequently Asked Questions (FAQs)
When is the midterm exam?
It will be held on Tuesday, February 23rd, 2:10 - 3:30 PM. We will attempt to start as soon afte

Econ 140 - Spring 2016
Section 8
GSI: Fenella Carpena
March 17, 2016
Additional Exercises
Question 1. For each of the following functions, state whether it can be linearized. If yes, write the
resulting regression function in a form that can be estimated

Econ 140 - Spring 2016
Section 6
GSI: Fenella Carpena
March 3, 2016
1
Omitted Variable Bias
Exercise 1.1. (Stock & Watson, Review the Concepts, Exercise 6.1) A researcher is interested in the effect
on test scores of computer usage. Using school district

Department of Economics
University of California
Spring 2016
Prof. Woroch
Economics 140: Problem Set 4
Due: Thursday, March 31st at 2:00 PM (before lecture)
Instructions: Include names and SIDs of the members of your study group and the name of the
single