Homework 4 Solutions
ACM/ESE 118, Fall 2008
Date: 11/13/2008.
(1) Montgomery 4.2 Note: We only are concerned with the regression model fitting y to x2 ,
x7 , and x8 as in problem 3.1.
(a) We can construct a normal plot with the following R code:
> footbal

Economics 20
Prof. Patricia M. Anderson
Problem Set 1
ANSWERS
Part I. Multiple Choice Problems
1. If X and Z are two random variables, then E[X-Z] is
d. E[X] E[Z]
This is just a simple application of one of the properties of expected value.
2. Any linear

Appendix 1 A
Review
Some Basic
Statistical Concepts
Random Variable
random variable:
A variable whose value is unknown until it is observed.
The value of a random variable results from an experiment.
The term random variable implies the existence of some

BRAC University, Fall 2013
Department of Economics and Social Sciences
ECO303: Introduction to Econometrics
Instructor: Tanvir Sobhan
Office Hours: Sunday and Tuesday, 12.30pm-1.50pm (and by appointment if required)
Email: tanvir.sobhan@bracu.ac.bd
Prereq

Goodness of Fit: R2 vs. Adjusted R2
You can think of the difference between R2 and adj. R2 this way.
The R2 assumes that every independent variable in the model helps to explain
variation in the DV. So, it tells you the percentage of explained variation

CHAPTER 25
Missing-data imputation
Missing data arise in almost all serious statistical analyses. In this chapter we
discuss a variety of methods to handle missing data, including some relatively simple
approaches that can often yield reasonable results.

Complutense University
Dep. of Quantitative Economics
Juan-Angel Jimenez-Martin
juanangel@ccee.umc.es
Econometrics exam
26 March 2012
14:00-16:00
Last Name:
First Name:
ID:
e-mail / Phone:
DO NOT forget to write your name
Materials permitted: Calculators,

Economics 20
Prof. Patricia M. Anderson
Problem Set 1
(due at the beginning of class October 9, 2000)
Part I. For each of the following questions, choose the one best answer. Briefly explain your reasoning.
1. If X and Z are two random variables, then E[X