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1、Gujarati:BasicFrontMatterPreface©TheMcGraw−HillEconometrics,FourthCompanies,2004EditionPREFACEBACKGROUNDANDPURPOSEAsinthepreviousthreeeditions,theprimaryobjectiveofthefourtheditionofBasicEconometricsistoprovideanelementarybutcomprehensiveintro-ductiontoeconometricswithout
2、resortingtomatrixalgebra,calculus,orstatisticsbeyondtheelementarylevel.InthiseditionIhaveattemptedtoincorporatesomeofthedevelopmentsinthetheoryandpracticeofeconometricsthathavetakenplacesincethepublicationofthethirdeditionin1995.Withtheavailabilityofsophisti-catedanduser-
3、friendlystatisticalpackages,suchasEviews,Limdep,Microfit,Minitab,PcGive,SAS,Shazam,andStata,itisnowpossibletodis-cussseveraleconometrictechniquesthatcouldnotbeincludedinthepre-viouseditionsofthebook.Ihavetakenfulladvantageofthesestatisticalpackagesinillustratingseveralexam
4、plesandexercisesinthisedition.Iwaspleasantlysurprisedtofindthatmybookisusednotonlybyeco-nomicsandbusinessstudentsbutalsobystudentsandresearchersinsev-eralotherdisciplines,suchaspolitics,internationalrelations,agriculture,andhealthsciences.Studentsinthesedisciplineswillfindt
5、heexpandeddis-cussionofseveraltopicsveryuseful.THEFOURTHEDITIONThemajorchangesinthiseditionareasfollows:1.Intheintroductorychapter,afterdiscussingthestepsinvolvedintra-ditionaleconometricmethodology,Idiscusstheveryimportantquestionofhowonechoosesamongcompetingeconometricm
6、odels.2.InChapter1,Idiscussverybrieflythemeasurementscaleofeco-nomicvariables.ItisimportanttoknowwhetherthevariablesareratioxxvGujarati:BasicFrontMatterPreface©TheMcGraw−HillEconometrics,FourthCompanies,2004EditionxxviPREFACEscale,intervalscale,ordinalscale,ornominalscale,
7、forthatwilldeterminetheeconometrictechniquethatisappropriateinagivensituation.3.TheappendicestoChapter3nowincludethelarge-samplepropertiesofOLSestimators,particularlythepropertyofconsistency.4.TheappendixtoChapter5nowbringsintooneplacethepropertiesandinterrelationshipsamo
8、ngthefourimportantprobabilitydistributionsthatareheavilyusedinthisbook,namely,thenormal,t,chisqu
