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1、Gujarati:BasicFrontMatterPreface©TheMcGraw−HillEconometrics,FourthCompanies,2004EditionPREFACEBACKGROUNDANDPURPOSEAsinthepreviousthreeeditions,theprimaryobjectiveofthefourtheditionofBasicEconometricsistoprovideanelementarybutcomprehensiveintro-ductiontoeco
2、nometricswithoutresortingtomatrixalgebra,calculus,orstatisticsbeyondtheelementarylevel.InthiseditionIhaveattemptedtoincorporatesomeofthedevelopmentsinthetheoryandpracticeofeconometricsthathavetakenplacesincethepublicationofthethirdeditionin1995.Withtheavai
3、labilityofsophisti-catedanduser-friendlystatisticalpackages,suchasEviews,Limdep,Microfit,Minitab,PcGive,SAS,Shazam,andStata,itisnowpossibletodis-cussseveraleconometrictechniquesthatcouldnotbeincludedinthepre-viouseditionsofthebook.Ihavetakenfulladvantageoft
4、hesestatisticalpackagesinillustratingseveralexamplesandexercisesinthisedition.Iwaspleasantlysurprisedtofindthatmybookisusednotonlybyeco-nomicsandbusinessstudentsbutalsobystudentsandresearchersinsev-eralotherdisciplines,suchaspolitics,internationalrelations,
5、agriculture,andhealthsciences.Studentsinthesedisciplineswillfindtheexpandeddis-cussionofseveraltopicsveryuseful.THEFOURTHEDITIONThemajorchangesinthiseditionareasfollows:1.Intheintroductorychapter,afterdiscussingthestepsinvolvedintra-ditionaleconometricmetho
6、dology,Idiscusstheveryimportantquestionofhowonechoosesamongcompetingeconometricmodels.2.InChapter1,Idiscussverybrieflythemeasurementscaleofeco-nomicvariables.ItisimportanttoknowwhetherthevariablesareratioxxvGujarati:BasicFrontMatterPreface©TheMcGraw−HillEco
7、nometrics,FourthCompanies,2004EditionxxviPREFACEscale,intervalscale,ordinalscale,ornominalscale,forthatwilldeterminetheeconometrictechniquethatisappropriateinagivensituation.3.TheappendicestoChapter3nowincludethelarge-samplepropertiesofOLSestimators,partic
8、ularlythepropertyofconsistency.4.TheappendixtoChapter5nowbringsintooneplacethepropertiesandinterrelationshipsamongthefourimportantprobabilitydistributionsthatareheavilyusedinthisbook,namely,thenormal,t,chisqu
