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1、Gujarati:BasicFrontMatterPreface©TheMcGraw−HillEconometrics,FourthCompanies,2004EditionPREFACEBACKGROUNDANDPURPOSEAsinthepreviousthreeeditions,theprimaryobjectiveofthefourtheditionofBasicEconometricsistoprovideanelementarybutcomprehensiveintro-ductiontoeconometricswithoutr
2、esortingtomatrixalgebra,calculus,orstatisticsbeyondtheelementarylevel.InthiseditionIhaveattemptedtoincorporatesomeofthedevelopmentsinthetheoryandpracticeofeconometricsthathavetakenplacesincethepublicationofthethirdeditionin1995.Withtheavailabilityofsophisti-catedanduser-fr
3、iendlystatisticalpackages,suchasEviews,Limdep,Microfit,Minitab,PcGive,SAS,Shazam,andStata,itisnowpossibletodis-cussseveraleconometrictechniquesthatcouldnotbeincludedinthepre-viouseditionsofthebook.Ihavetakenfulladvantageofthesestatisticalpackagesinillustratingseveralexample
4、sandexercisesinthisedition.Iwaspleasantlysurprisedtofindthatmybookisusednotonlybyeco-nomicsandbusinessstudentsbutalsobystudentsandresearchersinsev-eralotherdisciplines,suchaspolitics,internationalrelations,agriculture,andhealthsciences.Studentsinthesedisciplineswillfindtheex
5、pandeddis-cussionofseveraltopicsveryuseful.THEFOURTHEDITIONThemajorchangesinthiseditionareasfollows:1.Intheintroductorychapter,afterdiscussingthestepsinvolvedintra-ditionaleconometricmethodology,Idiscusstheveryimportantquestionofhowonechoosesamongcompetingeconometricmodels
6、.2.InChapter1,Idiscussverybrieflythemeasurementscaleofeco-nomicvariables.ItisimportanttoknowwhetherthevariablesareratioxxvGujarati:BasicFrontMatterPreface©TheMcGraw−HillEconometrics,FourthCompanies,2004EditionxxviPREFACEscale,intervalscale,ordinalscale,ornominalscale,fortha
7、twilldeterminetheeconometrictechniquethatisappropriateinagivensituation.3.TheappendicestoChapter3nowincludethelarge-samplepropertiesofOLSestimators,particularlythepropertyofconsistency.4.TheappendixtoChapter5nowbringsintooneplacethepropertiesandinterrelationshipsamongthefo
8、urimportantprobabilitydistributionsthatareheavilyusedinthisbook,namely,thenormal,t,chisqu
