ECON 104 W24 - Midterm Review
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Economics
Date
Jun 6, 2024
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Heteroskedasticity
Time Series
Endogeneity
Simultaneous Equations
ECON104 Midterm Review
February 19, 2024
Heteroskedasticity
Time Series
Endogeneity
Simultaneous Equations
Logistics
Exam is Thursday in class from 12:30 - 1:40PM.
Topics are heteroskedasticity, time series, and endogeneity.
Bring your student IDs and a calculator
Heteroskedasticity
Time Series
Endogeneity
Simultaneous Equations
What to study
The "style" of questions from the practice/previous midterm
on the website, however the way "coding" questions are
implemented will be different.
In particular, questions 5, 9, 12, and 13 in the practice midterm
There will still be problems that require you to interpret code,
and not just code output
Labs (including that Econ 103 lab PDF) are the best tools to
study the necessary code.
Reading/understanding code output is still required!
The discussion problems are also useful to study.
Heteroskedasticity
Time Series
Endogeneity
Simultaneous Equations
Other Code Tips
When studying the lab codes, think about the main
takeaways/lessons of the labs. There is more to keep in mind, but
think about the following questions:
Econ 103: How do the different selection methods compare, and
how do I choose the "best" subset according to each method.
Lab 1: How do I change standard errors from OLS to HC standard
errors? How do I implement WLS? How do I (manually) conduct a
GQ or BP type test?
Lab 2: What is the difference between setting up a time series
regression vs. a standard OLS model? How do I know when there is
autocorrelation, and when autocorrelation does not exist.
Lab 3: What is the difference between the lm and ivreg commands?
How do I know what the instruments, endogenous, and exogenous
variables are by reading a command? How do I interpret the
diagnostic tests in the ivreg output?
Heteroskedasticity
Time Series
Endogeneity
Simultaneous Equations
Heteroskedasticity Overview
Given data
(
x
i
,
y
i
)
, we may estimate a linear model:
y
i
=
β
1
+
β
2
x
i
+
e
i
(1)
Heteroskedasticity
Time Series
Endogeneity
Simultaneous Equations
Heteroskedasticity Overview
How do we test for it?
1
Breusch-Pagan (BP) Test
White Test
2
Goldfield-Quandt (GQ) Test
How do we fix it?
1
White Standard Errors (HC)
2
Weighted Least Squares
Your preview ends here
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Q Search
CENGAGE MINDTAP
lomework (Ch 08)
5. Deriving the short-run supply curve
Consider the perfectly competitive market for halogen lamps. The following graph shows the marginal cost (MC), average total cost (ATC), and
average variable cost (AVC) curves for a typical firm in the industry.
80
72
64
56
48
ATCA
40
32
24
16
AVC
MCO
8 16
QUANTITY OF OUTPUT (Thousands of lamps)
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40
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64
72
80
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WAGE (Dollars per hour)
20
18
16
14
12
10
8
6
4
2
0
X
0
•
I
Supply
I
I T Demand
I I
II I
|| 1
50 100 150 200 250 300 350 400 450 500
LABOR (Thousands of workers)
In this market, the equilibrium hourly wage is S
H
Graph Input Tool
Market for Labor in the Fast Food Industry
Chapter 4 HW Flashcards | Quizle X +
Wage
(Dollars per hour)
Labor Demanded
(Thousands of
workers)
and the equilibrium quantity of labor is
Search L pe
U
8
8
Suppose a senator introduces a bill to legislate a minimum hourly wage of $8. This type of price control is called a
300
Labor Supplied
(Thousands of
workers)
thousand workers.
O
3
D
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p=6−2q
p=2+q
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Week #1
Week #2
Week #3
Pvr = $ 3.00
Pvr = $ 5.00
Pvr = $ 5.00
Pm = $6.00
Pm = $ 6.00
Pm = $ 6.00
Y = $100.00
Y = $100.00
Y = $ 80.00
Qvr =
Qvr =
1
Qvr =
Qm =
1
Qm =
Qm =
Key:
Pvr = price of a video rental
Y = Raul's weekly income
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Qm = quantity of movie tickets Raul demands in week
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* CENGAGE MINDTAP
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(?)
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45
Supply
40
Demand
35
30
25
20
15
10
0 1 2 3 4 5 6 7 89
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* CENGAGE MINDTAP
J
Homework (Ch 08)
Q Search this course
Consider the following scenario to understand the relationship between marginal and average values. Suppose Rajiv is a professional basketball player,
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A-Z
Fill in the columns with Rajiv's free-throw percentage for each game and his overall free-throw average after each game.
Game
Game Result
Game Free-Throw Percentage
Total
Average Free-Throw Percentage
4/5
4/5
80
80
2/5
6/10
3
1/4
7/14
4
1/2
8/16
4/4
12/20
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Recommended textbooks for you
- Managerial Economics: Applications, Strategies an...EconomicsISBN:9781305506381Author:James R. McGuigan, R. Charles Moyer, Frederick H.deB. HarrisPublisher:Cengage Learning
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