代写ECON2206 Introductory Econometrics Week 4 Tutorials代做留学生SQL语言
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Introductory Econometrics
Week 4 Tutorials
• You will need STATA for this tutorial. If you are attending face2face tutorials is recommended you bring your laptop. For all tutorial you should have STATA installed or have the ability of accessing STATA trough the UNSW myAcess service. Please check if this is the case before the class.
• Prior to attending create a work folder on yourlaptop, say F:\IEwork, and copy the following files to that directory WAGE2. dta; hprice1. dta; Ch3 C2. do; Ch3 C6 . do. These files will be used in class.
• If you do have access to Stata, then feel free to try the questions beforehand.
Readings
• Read Chapter 2.5, 3.1-3.2, 3.5 thoroughly.
• Make sure that you know the meanings of the Key Terms at the end of chapter 3.
Review Questions (these may or may not be discussed in tutorial classes)
• What do we mean when we say “regress wage on educ and exper”?
• Why and under what circumstance do we need to “control for” exper in the regres- sion model in order to quantify the efect of educ on wage?
• What is the bias of an estimator?
• What is the requirement of the ZCM assumption, in your own words?
• How do you know that the OLS estimators are linear combination of the observations on the dependent variable?
• What is Gauss-Markov theorem?
• What is an endogenous explanatory variable? Exogenous explanatory variable?
• What is multicollinearity and what is its likely efect on the OLS estimators?
Problem Set (these will be discussed in tutorial classes)
• Wooldridge Ch3 Q2
• Wooldridge Ch3 QC2
• Wooldridge Ch3 QC6
• As a continuation of Ch3 QC6, suppose you generated residuals from the regression in part (1), call this variable IQres. Next generate residuals from the regression in part (2), call this variable lwageres. Finally run a simple regression of lwageres on IQres. What would you expect to obtain as the estimated coefficient on IQres?
