kenny_2009_mediation英文文献资料

《kenny_2009_mediation英文文献资料》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、5/18/2010Mediation(DavidA.Kenny)DavidA.KennyNovember15,2009Learnhowyoucandoamediationanalysisandoutputatextdescriptionofyourresults:GotoDataToText.MEDIATIONWhatisMediation?Baron&KennyStepsMeasuringMediationortheIndirectEffectDesignIssuesSpecificationErrorExtensionsLinkstoOtherSitesRefer

2、encesWhatIsMediation?ConsideravariableXthatisassumedtoaffectanothervariableY.ThevariableXiscalledtheinitialvariableandthevariablethatitcausesorYiscalledtheoutcome.Indiagrammaticform,theunmediatedmodelisTheeffectofXonYmaybemediatedbyaprocessormediatingvariableM,andthevariableXmaystillaff

3、ectY.Pathciscalledthetotaleffect.Themediatedmodelisdavidakenny.net/cm/mediate.htm1/115/18/2010Mediation(DavidA.Kenny)(Thesetwodiagramsareessentialtotheunderstandingofthispage.Pleasestudythemcarefully!)Pathc'iscalledthedirecteffect.Themediatorhasbeencalledaninterveningorprocessvariable.C

4、ompletemediationisthecaseinwhichvariableXnolongeraffectsYafterMhasbeencontrolledandsopathc'iszero.PartialmediationisthecaseinwhichthepathfromXtoYisreducedinabsolutesizebutisstilldifferentfromzerowhenthemediatoriscontrolled.Notethatamediationalmodelisacausalmodel.Forexample,themediatoris

5、presumedtocausetheoutcomeandnotviceversa.Ifthepresumedmodelisnotcorrect,theresultsfromthemediationalanalysisareoflittlevalue.Mediationisnotdefinedstatistically;ratherstatisticscanbeusedtoevaluateapresumedmediationalmodel.ThereadershouldconsultthesectionbelowonSpecificationError.Thereisa

6、longhistoryinthestudyofmediation(Hyman,1955;MacCorquodale&Meehl,1948).Currentlymediationisaverypopulartopic.(Thispageaveragesover200visitorsadayandBaron&Kennyhasover15000citations.)Thereareseveralreasonsfortheintenseinterestinthistopic.Onereasonfortestingmediationistryingtounderstandthe

7、mechanismthroughwhichtheinitialvariableaffectstheoutcome.Mediation(andmoderation)analysisareakeypartofwhathasbeencalledprocessanalysis.Moreoverwhenmostcausalorstructuralmodelsareexamined,themediationalpartofthemodelisthemostinteresting.BaronandKennyStepsIfthemediationalmodel(se