HereisabriefintroductionforLectureNote6coveringPooledCrossSectionsandPanelDataAnalysis(Chapters13and14)fromWooldridge'sIntroductoryEconometrics:Thislecturenotecoverstwoimportanttopicsinappliedeconometrics:pooledcrosssectionsandpaneldataanalysis.Chapter13introducespooledcross-sectionaldata,whichcombinesindependentcrosssectionscollectedatdifferentpointsintime.Wewilllearnhowtousetimedummiesandinteractthemwithothervariablestoexaminechangesinrelationshipsovertime.Thechapteralsocoverspolicyanalysisusingpooledcrosssections,includingbefore-aftercomparisonsanddifference-in-differencesestimation.Chapter14focusesonpaneldatamethods,whereweobservethesamecross-sectionalunitsovermultipletimeperiods.Wewillstudythekeyadvantagesofpaneldataandlearnhowtoestimatefixedeffectsmodels(bothentity-demeanedandfirst-differencedapproaches)tocontrolforunobservedheterogeneity.ThenotealsocoversrandomeffectsmodelsandhowtochoosebetweenfixedandrandomeffectsusingtheHausmantest.Practicalestimationissuesandinterpretationofresultswillbeemphasizedthroughout.
