历史考试范例老师课件.pptx

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历史考试范例老师课件.pptx

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IntraclasscorrelationcoefficientsReliabilityandmore…AlexaRomberg710DiscussionSection2/11/09REVISED2/18/09

2*Sources*ShroutFleiss(1979)PsychBulletin(oncoursewebsite)McGrawWong(1996)PsychMethods(wille-mail,N.B.hassomecorrectionsthatwerepublishedlaterthatyear)(directlytranslatestoSPSS)

3ICC’svs.Pearson’srPearson’srmeasuresinterclasscorrelationsVariablesarefromdifferent“classes”,theymeasuredifferentconstructs:e.g.,IQandGPA;heightandweight;celebritypopularityandnumberofmarriagesICC’s(therearemanyofthem)measurecorrelationswithina“class”Variablesaredifferentmeasurementsofthesamething/constructTheycouldberepeatedmeasuresonthesameparticipant,suchasforreliabilityOrtheycouldbemeasuresonmultiplepeoplewithinthesamegroup,e.g.,twins,studentsinaclassroom

4ICC’sGeneralgoalistodeterminetheproportionofvariationinameasurethatisduetobeingamemberofaparticulargroupForexample,considerastudyof5families,eachofwhichhas3children,inwhichyoumeasuretheIQandageofeachchildIfyouareinterestedinhowfamilymembershipandIQarerelated,youwoulduseanICCIfyouareinterestedinhowageandIQarerelated,youwouldusePearson’sr

5ManydifferentkindsofICC’sSomehavenamesyoumayrecognize:Cronbach’salphaHeritabilitycoefficientsKish’srateofhomogeneityOthersdon’tappeartohavenamesotherthansomewhatconfusingindices:ICC(C,1),ICC(1)

6ExamplesofdatalayoutforICCWhattypeofanalysisdothesetablescalltomind?

7CalculatinganICCStep1:PartitionthevariancebyenteringdataintoanappropriateANOVAmodelStep2:EntertherelevantMeanSquaresintotheformulafortheICCofinterestThiscanbedone(opaquely)inSPSSunder:Analyze-Scale-ReliabilityAnalysis-Model(Alpha)-Statistics

8CalculatinganICC(reliabilityframework)Thisboilsdowntounderstandingthesourcesofsystematicvarianceintheratings