ECON 104 W24 - Midterm Review

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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
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