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SPSS方差分析.doc

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UsingSPSS:Mixed-DesignANOVA.Page ResearchMethodsII:SpringTerm2002 UsingSPSS:Two-wayMixed-designANOVA Supposewehaveperformedanexperimentinvestigatingsexdifferencesintheeffectsofcaffeineonmemory.Wehavetwoindependentvariables.Ononeofthese,caffeineconsumption,wehaverepeatedmeasures(i.e.itisawithin-subjectsvariable).Therearethreelevelsofcaffeineconsumption,low,mediumandhigh,andeachsubjectdoesallthreeconditions.OntheotherIV,sexofsubject,wehaveindependentmeasures(i.e.itisabetween-subjectsvariable):therearetwolevelsofthisIV,maleandfemale.Atwo-waymixed-designANOVA(withindependentmeasuresonsexandrepeatedmeasuresoncaffeineconsumption)istheappropriatetestinthesecircumstances. 1.EnteringtheData: Aswiththepreviousrepeated-measuresANOVA'sinSPSS,wehavetouseaseparatecolumnforeachconditionoftherepeated-measuresvariable(caffeineconsumptioninthisexample),.Wealsohavetoincludeacolumncontainingcode-numbersthattellSPSSwhichgroupoftheindependent-measuresvariableeachsubjectbelongsto.Inthisexample,ourdatamightlooklikethis: Thefirstcolumn,"subject",ismerelytoremindyouthereisonerowpersubject.Thenextthreecolumns,"lowcaff","medcaff"and"highcaff",containeachsubject'smemory-testscoreforthelow-,medium-andhigh-caffeineconsumptionconditionsrespectively.Thefinalcolumn,"sex",tellsSPSSthesexofeachsubject,(I'veused"1"tosignify"male",and"2"todesignate"female"). RunningtheANOVA: Havingenteredyourdata,dothefollowing. (a)Clickon"Analyze";thenclickon"GeneralLinearModels";thenclickon"RepeatedMeasures".The"RepeatedMeasuresDefineFactor(s)dialogboxappears(thesameoneasyouusedtoperformone-wayandtwo-wayrepeatedmeasuresANOVA's). (b)Foreachofyourrepeated-measuresIV's,youhavetomakeentriesinthisbox.YouhavetotellSPSSthenameofeachrepeated-measuresIV,andhowmanylevelsithas,injustthesamewayasyouwouldforpreviousrepeated-measuresANOVA's. Inourexample,wehavejustonerepeated-measuresIV:caffeineconsumption.Replacethewords"factor1"withamoremeaningfulnamethatdescribesthevariable-forexample,"caffeine".Thenenterthenumberofl