Download - Cronbach's Alpha (Reliability of test scores) · PDF file · 2016-12-27UKCAT and interview scores. The UKCAT and interview scores did not predict student performance (β = .12, t

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Page 1: Cronbach's Alpha (Reliability of test scores) · PDF file · 2016-12-27UKCAT and interview scores. The UKCAT and interview scores did not predict student performance (β = .12, t

HowdoIreportthestatisticalproceduresusedintheAmericanPsychologicalAssociation(APA)guidelines?Mean=M;StandardDeviation=SDForexample:Themeanscoreontheempathyscalewas130(SD=10.12).PercentageForexample:Approximatelyhalf(51%)ofthesamplewerefemalestudents.CorrelationsForexample:TheresultsshowthatthereisastrongcorrelationbetweentheEbelratingsandstudentability(r=0.88,p=0.03).MultipleLinearRegressionForexample:AmultiplelinearregressionwasusedtopredictstudentperformancebasedonUKCATandinterviewscores.TheUKCATandinterviewscoresdidnotpredictstudentperformance(β=.12,t(445)=0.1.81,p=0.34).TheUKCATandtheinterviewscoresexplainanon-significantofthevarianceinstudentscores(R2=0.01,F(2,334)=0.99,p=0.56).T-TestsForexample:Thereisastatisticallysignificantdifferencebetweentheempathyscoresandgender(t(345)=3.2,p=0.01),withfemalestudentsreceivinghigherscoresthanmalestudents.Thereisnoasignificantdifferenceintheempathyscoresbetweenfemale(M=110,SD=11.3)andmale(M=110.5,SD=10.5)students(t(345)=1.66,p=0.11).AnalysisofVariance(ANOVA)Forexample:Thereisastatisticallysignificantdifferencebetweentheempathyscoresandyearsofmedicalschool(F(14,775)=4.98,p=0.04).ATukeypost-hoctestindicatesthatthereisastatisticallysignificantdifferencebetweentheemptyscoresandyear1(M=125,p=0.041)andyear2(M=120,p=0.00)comparedtoyear5(M=90).Thereisnoasignificantdifferenceintheempathyscoresforyear3andyear4ofmedicaleducation(p=0.21). Chi-SquareTestForexample:Thereisnoastatisticallysignificantassociationbetweengenderandthepass/faildecision(χ2(1,N=220)=0.44,p=0.21).Mann-WhitneyUTestForexample:AMann-WhitneyUtestshowsthatfemalestudents(Mdn=110)outperformmalestudents(Mdn=92)ontheempathyscale(U=44.3,p=0.01).Kruskal-WallisHTestForexample:AKruskal-WallisHtestwasperformedtoexploretheempathyscoresasstudentsprogressthroughmedicaleducation,i.e.year1toyear5.Thereisastatisticallysignificantdifferencebetweentheempathyscoresandyearsofmedicalschooltraining(χ2(2,

Page 2: Cronbach's Alpha (Reliability of test scores) · PDF file · 2016-12-27UKCAT and interview scores. The UKCAT and interview scores did not predict student performance (β = .12, t

N=24)=4.21,p=0.02)withameanrankempathyscoreof20foryear1,14foryear2,12foryear3,10foryear4and9foryear5.TheresultsoftheBonferroniposthoctestshowasignificantdifferencebetweentheempathyscoreandyear5ofmedicalschool.Cronbach'sAlpha(Reliabilityoftestscores)TheJeffersonScaleofEmpathyconsistedof20itemswiththreesubscales.ThePerspectiveTakingsubscaleconsistedof10items(Alpha=0.74),theCompassionateCaresubscaleconsistedof8items(Alpha=0.70),andtheWakinginthePatient’sShoessubscaleconsistedof2items(Alpha=0.58).FactoranalysisForexample,sayyouhavedevelopedascalewith22itemstomeasureaspecificconstruct.Theseitemshavebeensubjectedtoexploratoryfactoranalysis(EFA),assumingthefactoranalysisapproachissuitablewithall22items.Consideringthreefactors/componentshavebeenemergedfromtheEFAmethod,thefollowingtablesneedtobereported:Table1.PrinciplecomponentanalysisoftheXscalewithcommunalitiesofeachitem(N=xx)

Item Factor1 Factor2 Factor3 h2 Mean SD1 0.65 0.85 4.8 1.22 0.63 0.80 4.3 1.13 0.62 0.78 4.6 1.04 0.60 0.76 4.9 0.55 0.59 0.73 4.7 0.26 0.58 0.72 4.6 0.37 0.54 0.70 4.2 0.78 0.50 0.69 4.1 0.69 0.48 0.60 4.0 0.410 0.44 0.64 4.8 0.411 0.60 0.71 4.9 0.912 0.56 0.70 4.7 1.313 0.52 0.69 4.1 1.514 0.51 0.58 4.0 1.115 0.44 0.52 3.9 1.916 0.40 0.51 3.0 1.017 0.33 0.52 4.1 0.918 0.51 0.45 4.9 1.719 0.50 0.44 4.0 1.420 0.44 0.42 4.8 1.321 0.32 0.40 4.7 1.222 0.30 0.64 3.9 1.2

%Variance 44.1 17.1 11.2 Note:Factorloadinglessthan0.30wereremoved

Page 3: Cronbach's Alpha (Reliability of test scores) · PDF file · 2016-12-27UKCAT and interview scores. The UKCAT and interview scores did not predict student performance (β = .12, t

Table2.DescriptivestatisticsforthethreeXfactors(N=xx)

No.Items Cronbach’salpha M(SD) Skewness KurtosisFactor1 10 0.80 4.1(1.1) 0.45 0.39Factor2 7 0.75 4.0(0.8) 0.44 0.44Factor3 5 0.69 4.5(1.2) 0.61 0.11

Note:Factorsshouldbenamed/labelled.Forexample,theitemsthathavebeenloadedinFactor1cabbenamed/labelledasxxx.Note:Allvaluesprovidedaredummy.