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1、Gujarati:BasicFrontMatterPreface©TheMcGraw−HillEconometrics,FourthCompanies,2004EditionPREFACEBACKGROUNDANDPURPOSEAsinthepreviousthreeeditions,theprimaryobjectiveofthefourtheditionofBasicEconometricsistoprovideanelementarybutcomprehensiveintro-ductiontoecon
2、ometricswithoutresortingtomatrixalgebra,calculus,orstatisticsbeyondtheelementarylevel.InthiseditionIhaveattemptedtoincorporatesomeofthedevelopmentsinthetheoryandpracticeofeconometricsthathavetakenplacesincethepublicationofthethirdeditionin1995.Withtheavaila
3、bilityofsophisti-catedanduser-friendlystatisticalpackages,suchasEviews,Limdep,Microfit,Minitab,PcGive,SAS,Shazam,andStata,itisnowpossibletodis-cussseveraleconometrictechniquesthatcouldnotbeincludedinthepre-viouseditionsofthebook.Ihavetakenfulladvantageofthes
4、estatisticalpackagesinillustratingseveralexamplesandexercisesinthisedition.Iwaspleasantlysurprisedtofindthatmybookisusednotonlybyeco-nomicsandbusinessstudentsbutalsobystudentsandresearchersinsev-eralotherdisciplines,suchaspolitics,internationalrelations,agri
5、culture,andhealthsciences.Studentsinthesedisciplineswillfindtheexpandeddis-cussionofseveraltopicsveryuseful.THEFOURTHEDITIONThemajorchangesinthiseditionareasfollows:1.Intheintroductorychapter,afterdiscussingthestepsinvolvedintra-ditionaleconometricmethodolog
6、y,Idiscusstheveryimportantquestionofhowonechoosesamongcompetingeconometricmodels.2.InChapter1,Idiscussverybrieflythemeasurementscaleofeco-nomicvariables.ItisimportanttoknowwhetherthevariablesareratioxxvGujarati:BasicFrontMatterPreface©TheMcGraw−HillEconometr
7、ics,FourthCompanies,2004EditionxxviPREFACEscale,intervalscale,ordinalscale,ornominalscale,forthatwilldeterminetheeconometrictechniquethatisappropriateinagivensituation.3.TheappendicestoChapter3nowincludethelarge-samplepropertiesofOLSestimators,particularlyt
8、hepropertyofconsistency.4.TheappendixtoChapter5nowbringsintooneplacethepropertiesandinterrelationshipsamongthefourimportantprobabilitydistributionsthatareheavilyusedinthisbook,namely,thenormal,t,chisqu
