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ECON 5420 Study Guide - Final Guide: Instrumental Variable, Econometrics, Statistical InferenceExam


Department
Economics
Course Code
ECON 5420
Professor
Ryan Ruddy
Study Guide
Final

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Exam 2, Version 1 Econ 5420, Econometrics II, Spring 2016
Section: Name:
1 Multiple Choice
Choose the answer that best answers the question. Each question is worth 3 points.
Answers must be clearly written on the supplied answer sheet.
1. If I estimate the equation W ageit =β0+β1xit +αf+it, where αfis a family
fixed effect, what x variable cannot be included.
(a) mother’s education
(b) education
(c) age
(d) None of the above
2. What problem can be caused by a weak first stage in an IV regression?
(a) The exclusion restriction is violated.
(b) The order condition is violated.
(c) Statistical inference based on t-stats is misleading.
(d) The IV estimates are biased.
3. Suppose we estimate the DD equation yit =β0+β1T reati+β2Aftert+β3T reat
Afterit +it. Which represents ¯yfor the treated group before treatment?
(a) β3
(b) β2+β3
(c) β1+β2+β3
(d) β0+β1+ +β2+β3
4. Which best describes the order condition for instrumental variables?
(a) We must have at least as many instruments as endogenous variables.
(b) Instruments must not be correlated with the structural error.
(c) There must be a strong first stage.
(d) Endgoenous variables must not be correlated with the error term.

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5. Which scenarios(s) apply if the parallel trend assumption is violated in a difference
in differences estimation?
(a) The DD estimator is still unbiased.
(b) We could find that treatment has zero effect when there actually is an effect.
(c) We could find that treatment has an effect when there actually is not an
effect.
(d) B & C.
6. Which of the following types of variables cannot be included in a fixed effects
model?
(a) Discrete dependent variable
(b) Time-varying independent variable
(c) Time-constant independent variable
(d) Dummy variables of any type
7. Let year2011 be a dummy variable equal to one in 2011. Suppose we have data
from 2011 and 2012. If we estimate the equation wageit =β0+β1year2011t+
β2educationit +β3year2011 educationit +eit, what does ˆ
β3tell us?
(a) The returns to eduction in 2011
(b) The difference between returns to education in 2011 and 2012
(c) The difference in wages in 2011 relative to 2012
(d) The returns to education
8. Which of the following statements is true about probits:
(a) ˆ
βis the increase in p(y= 1) for a marginal increase in x
(b) Predicted probabilities can be negative.
(c) ˆ
βis estimated through OLS.
(d) The error term is assumed to follow a normal distribution.
9. Suppose we have data on wage and education where wage has been censored at
$30 per hour and education positively affects wages. If ˆ
βrepresents the estimated
returns to education with OLS and ˆαestimates the estimated returns of education
with a censored regression model, which is true?
(a) ˆ
β= ˆα
(b) ˆ
β < ˆα
(c) ˆ
β > ˆα
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10. Which of the following assumptions is required to obtain a first-differenced esti-
mator in a two-period panel data analysis?
(a) The explanatory variable does not change over time for any individuals.
(b) The explanatory variable changes by the same amount in each time period.
(c) The variance of the error term in the regression model is not constant.
(d) The explanatory variable changes over time for some individuals.
11. Suppose I want to estimate the equation yi=β0+β1x1i+β2x2i+β3x3ii, but
x1iis endogenous. What is required for a consistent IV estimation using zias an
instrument?
(a) Cov(i, zi) = 0
(b) Cov(i, x2i)=0
(c) Cov(x1i, zi)6= 0
(d) All of the above
12. Which is true of a balanced panel?
(a) Each individual is surveyed every year .
(b) Each year a new set of individuals are surveyed.
(c) There are the same number of time periods as individuals.
(d) All of the above.
13. The model is designed to model corner solution dependent vari-
ables.
(a) linear probability
(b) logit
(c) probit
(d) Tobit
14. Bias caused by individuals leaving a panel.
(a) Attrition bias
(b) Omitted Variable bias
(c) Misspecification bias
(d) None of the above
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