Problem Set 1
Due: in section, (February 9)
Problem 1: Provide short answers for the following questions:
(a) Suppose that X denotes the amount of rainfall in your hometown during a given
month and Y denotes the number of children born in Los Angeles duri

Problem 1
This problem is based on the study of the housing market. The researcher has data on 300
transactions in Chicago area. For each transaction she knows the price and some of the important
characteristics of the house involved. In order to uncover

Practice problems, quiz 3
Problem 1: Restaurant Hygiene Grades
This problem is based on the recent study of Los Angeles restaurant market. The next
paragraph provides some background information about the subject of the study.
Until year 1998, the Los Ang

Problem Set 4
Due in section the week of April 20, 2015
Problem 1
For this exercise, use the data in AIRFARE.xls (airfair.des provides description
of variables) but only for the year 1997.
1. A simple demand function for airline seats on routes in the Uni

Determinants of Earnings and Discrimination in the Market Place
1 Introduction
The working of the labor market is perhaps one of the most widely studied phenomena in
all of economic science. Considering that the market for labor is arguably the largest or

Johns Hopkins University
AS180.334, Spring 2015
Notes on Simultaneous Equations Models
Supply and Demand Models Revisited
Suppose we have monthly data on aggregated gasoline sales in Baltimore and average
gasoline prices for the years 1993 to 1997. We con

Introduction to Econometrics
Spring 2015
Problem Set 3
Problem 1
Consider the following regression model without intercept:
Yi = Xi + Ui .
Assume that regressors Xi s are xed at soem numerical values xi . Thus, unlike in the calculation
in class, only the

Sample Quiz
Time Limit: 70 minutes
Instructions:
1. Total number of points is 70. The number of points for each problem indicates approximate time
in minutes that should be allocated to the problem.
2. The exam is closed book and closed notes. However, yo

Problem Set 2
Problem 1: Problem 4.2 from Stock and Watson.
Problem 2:
In this problem you will investigate the relationship between a workers age and
earnings. (Generally, older workers have more job experience, leading to higher
productivity and earning

Labor Supply and Earnings
DATA DESCRIPTION
The following is a list of variables contained in the files:
cps80.wf1
cps85.wf1
cps90.wf1
NOTE: the data set only contains males. However, we did not eliminate individuals who
reported to have been unemployed.
W