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1、Gujarati:BasicFrontMatterPreface©TheMcGraw−HillEconometrics,FourthCompanies,2004EditionPREFACEBACKGROUNDANDPURPOSEAsinthepreviousthreeeditions,theprimaryobjectiveofthefourtheditionofBasicEconometricsistoprovideanelementarybutcomprehensiveintro-ductiont
2、oeconometricswithoutresortingtomatrixalgebra,calculus,orstatisticsbeyondtheelementarylevel.InthiseditionIhaveattemptedtoincorporatesomeofthedevelopmentsinthetheoryandpracticeofeconometricsthathavetakenplacesincethepublicationofthethirdeditionin1995.Wit
3、htheavailabilityofsophisti-catedanduser-friendlystatisticalpackages,suchasEviews,Limdep,Microfit,Minitab,PcGive,SAS,Shazam,andStata,itisnowpossibletodis-cussseveraleconometrictechniquesthatcouldnotbeincludedinthepre-viouseditionsofthebook.Ihavetakenfull
4、advantageofthesestatisticalpackagesinillustratingseveralexamplesandexercisesinthisedition.Iwaspleasantlysurprisedtofindthatmybookisusednotonlybyeco-nomicsandbusinessstudentsbutalsobystudentsandresearchersinsev-eralotherdisciplines,suchaspolitics,interna
5、tionalrelations,agriculture,andhealthsciences.Studentsinthesedisciplineswillfindtheexpandeddis-cussionofseveraltopicsveryuseful.THEFOURTHEDITIONThemajorchangesinthiseditionareasfollows:1.Intheintroductorychapter,afterdiscussingthestepsinvolvedintra-diti
6、onaleconometricmethodology,Idiscusstheveryimportantquestionofhowonechoosesamongcompetingeconometricmodels.2.InChapter1,Idiscussverybrieflythemeasurementscaleofeco-nomicvariables.ItisimportanttoknowwhetherthevariablesareratioxxvGujarati:BasicFrontMatterP
7、reface©TheMcGraw−HillEconometrics,FourthCompanies,2004EditionxxviPREFACEscale,intervalscale,ordinalscale,ornominalscale,forthatwilldeterminetheeconometrictechniquethatisappropriateinagivensituation.3.TheappendicestoChapter3nowincludethelarge-sampleprop
8、ertiesofOLSestimators,particularlythepropertyofconsistency.4.TheappendixtoChapter5nowbringsintooneplacethepropertiesandinterrelationshipsamongthefourimportantprobabilitydistributionsthatareheavilyusedinthisbook,namely,thenormal,t,chisqu
