hw2_answer_120c_su07_S2

Hw2_answer_120c_su07 - STUDENT CONSENT FOR RELEASE OF STUDENT INFORMATION(Buckley Waiver I hereby authorize the UCSD Economics Department to return

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STUDENT CONSENT FOR RELEASE OF STUDENT INFORMATION (Buckley Waiver) I hereby authorize the UCSD Economics Department to return my graded final examination/research paper by placing it in a location accessible to all students in the course. I understand that the return of my examination/research paper as described above may result in disclosure of personally identifiable information, that is not public information as defined in UCSD PPM 160-2, and I hereby consent to the disclosure of such information. Quarter Summer 2007-S1 Course Econ 120C Date August 2, 2007 Instructor Professor Yongil Jeon S t u d e n t I D # P r i n t N a m e S i g n a t u r e
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2 Answer to HW #2, ECO 120C, Summer 2007 – S2 Economics 120C Name: _________________________ September 4, 2007 Student ID#: _______________ Answer to Homework #2 – Summer 2007-Session 2, Econ 120C (Answer to Final Exam, Summer 2007-Session 1, Econ 120C) Answer all questions on separate paper. This problem set should be handed in to your TA at the beginning of your review session on Tuesday, September 4, 2007. Problem sets may not be handed in once solutions have been distributed. Please write down your name and PID clearly. Good luck! 1. (15 points) Multiple Choices 1-a) (3 points) With panel data, the causal effect a. cannot be estimated since correlation does not imply causation. b. is typically estimated using the probit regression model. c. can be estimated using the “differences-in-differences” estimator. d. can be estimated by looking at the difference between the treatment and the control group after the treatment has taken place. Answer : c 1-b) (3 points) Consider the special panel case where T = 2. If some of the omitted variables, which you hope to capture in the changes analysis, in fact change over time, then the estimator on the included change regressor a. will be unbiased only when allowing for heteroskedastic-robust standard errors. b. may still be unbiased. c. will only be unbiased in large samples. d. will always be unbiased. Answer : b 1-c) (3 points) In the Fixed Effects regression model, using ( n – 1) binary variables for the entities, the coefficient of the binary variable indicates a. the level of the fixed effect of the i th entity. b. will be either 0 or 1. c. the difference in fixed effects between the i th and the first entity. d. the response in the dependent variable to a percentage change in the binary variable. Answer : c
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3 Answer to HW #2, ECO 120C, Summer 2007 – S2 1-d) (3 points) Time Fixed Effects regression are useful in dealing with omitted variables a. even if you only have a cross-section of data available. b. if these omitted variables are constant across entities but vary over time. c. when there are more than 100 observations. d. if these omitted variables are constant across entities but not over time. Answer : b 1-e) (3 points) The main advantage of using panel data over cross sectional data is that it a. gives you more observations.
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This note was uploaded on 09/18/2008 for the course ECON 100B taught by Professor Rauch during the Winter '07 term at UCSD.

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Hw2_answer_120c_su07 - STUDENT CONSENT FOR RELEASE OF STUDENT INFORMATION(Buckley Waiver I hereby authorize the UCSD Economics Department to return

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