*AREC 489F Problem Set #6
*November 24, 2014
*Problem Set 6 do file
*Set directory (tell Stata which folder to use):
*-Problem 1-
use "/users/joshpotash/Downloads/organics_gdp.dta" /Load data file
desc /Description of the data
*1.1
graph twoway (connect
*AREC 489F Problem Set #5
*November 1, 2014
*Problem Set 5 do file
*Set directory (tell Stata which folder to use):
cd C:\Users\LB\Documents\Stata
*-Problem 1-
*1.2
use beauty_hw5.dta /Load data file
desc /Description of the data
*1.1
summarize educatio
u is "mean independent" of x: The mean (expected value) of u is the same
across all slices of the population determined by x
activity; diet; genetics
1.1)
i)
The OLS coefficient estimator, 1-hat and 0-hat, is unbiased,
meaning that E(1-hat)= 1 and E(0-hat
Test Authorization Form
DSS Testing Office
0118 Shoemaker 301.314.7217 / Fax 301.314.9478
University of Maryland, College Park 20742
To be filled out by Student:
Joshua Potash
Student Name: _
AREC489F
Course Name and Number: _
11/07
Date of Exam at DSS: _
Homework #5
AREC 489F
October 28, 2014
Due: 11/03/2014 at 12:00PM sharp.
Reminders: No late homeworks will be accepted. You must show all work to get credit for your
answers. If you work with classmates, you are required to list their names on your proble
AREC 489F, Fall 2014
Homework #8
Due: 12/11 by 12:00PM sharp. No late homeworks will be accepted. You must show all
work to get credit for your answers. If you work with classmates, you are required to list their
names on your problem set, and you must su
Homework #1
AREC 489F
September 22, 2014
Due: 9/29/2014 at 12:00PM sharp.
Reminders: No late homeworks will be accepted under any circumstances. You must show all
work to get credit for your answers. If you work with classmates, you are required to list t
Important Terms
The F test compares the SSR across models to gage the importance of including sets of
variables in the regression because the SSR increases when variables are dropped from a
model (this would be the restricted SSR). We want to determine wh
AREC 489F, Fall 2014
Homework #6
Due: 11/26/2014 by 11:59PM sharp. Note the time dierence! You can email us copies
of your problem sets if you are traveling.
Reminders: No late homeworks will be accepted. You must show all work to get credit for your
answ
AREC 489F: The Simple Linear Regression Model
Lint Barrage
September 15, 2014
Barrage (UMD)
AREC 489F
September 15, 2014
1 / 57
Housekeeping
Problem set #1 posted this morning ! Due next Monday (9/15)
Updated Syllabus posted, including:
Revised Pset due d
JoshuaPotash
ProfessorBarrage
Econometrics
October19,2014
AREC489F:
Problem Set #4
1)NO, it is not the same as conducting four separate hypothesis tests by computing tstatistics. We cannot use individual t-statistics for 1,2,3,and4totestH0.
Individual t-s
AREC 489F: Panel Data Review and Practice
Lint Barrage
December 1, 2014
Barrage (UMD)
AREC 489F
December 1, 2014
1 / 64
Panel Data: Review and Practice
Assume you have data on airfares across city pairs in 1997 and 1998
You want to explore impact of marke
AREC 489F: The Simple Linear Regression Model
Lint Barrage
September 17, 2014
Barrage (UMD)
AREC 489F
September 17, 2014
1 / 73
The Simple Linear Regression Model
Simple linear regression model assumes a linear relationship between
x and y
y = 0 + 1 x + u
JoshuaPotash
PROBLEM1
1.1)
1.2)
1.3)
organic_salest = -70.40679+0.0053395
When holding all else equal, for every +1 $billion increase in GDP, organic dairy sales
increase by $0.0053 billion = $5.3 million. Yes, the effect of GDP on organic sales is
highly
AREC 489F: Instrumental Variables
Lint Barrage
December 10, 2014
Earrage Indra-ID] .IEILHEC 'QF December 1|], Ell'l Further Notes about IV
e IV works for multiple endogenous variables, e-g-, and ya :
F1 2 18s I 1813? l I82? I 18331 l ~18rc3kl 1
it With