IELTS analysis data

IELTS|Researchers-Testperformance2011Eachyear,multipleversionsofeachofthesixIELTSmodules(Listening,AcademicReading,GeneralTrainingReading,AcademicWriting,GeneralTrainingWriting,andSpeaking)arereleasedforusebycentrestestingIELTScandidates.Reliabilityestimatesfortheobjectivelyandsubjectivelyscoredmodulesusedin2011arereportedbeloReliabilityofobjectively-scoredmodules(ReadingandListening)ThereliabilityofListeningandReadingtestsisreportedusingCronbach'salpha,areliabilityestimatewhichmeasurestheinternalconsistencyofthe40-itemtest.ThefollowingListeningandReadingmaterialreleasedin2011hadsufficientcandidateresponsestoestimateandreportmeaningfulreliabilityvaluesasfollows:ModuleAlphaListeningversion5350.90Listeningversion5360.90Listeningversion5370.92Listeningversion5380.89Listeningversion5390.91Listeningversion5400.91Listeningversion5410.92Listeningversion5420.91Listeningversion5430.89Listeningversion5440.89Listeningversion5450.92Listeningversion5460.89Listeningversion5470.89Listeningversion5480.91Listeningversion5490.93Listeningversion5500.92AverageAlphaacrossversions0.91ModuleAlphaGeneralTrainingreadingversion4010.92GeneralTrainingreadingversion4020.92GeneralTrainingreadingversion4030.91GeneralTrainingreadingversion4040.90GeneralTrainingreadingversion4050.92GeneralTrainingreadingversion4060.92GeneralTrainingreadingversion4070.92GeneralTrainingreadingversion4080.93ModuleAlphaGeneralTrainingreadingversion4090.94GeneralTrainingreadingversion4100.92GeneralTrainingreadingversion4110.94GeneralTrainingreadingversion4120.92GeneralTrainingreadingversion4130.92GeneralTrainingreadingversion4140.92GeneralTrainingreadingversion4150.91GeneralTrainingreadingversion4160.94AverageAlphaacrossversions0.92ModuleAlphaAcademicreadingversion5350.93Academicreadingversion5360.88Academicreadingversion5370.90Academicreadingversion5380.88Academicreadingversion5390.89Academicreadingversion5400.89Academicreadingversion5410.91Academicreadingversion5420.90Academicreadingversion5430.90Academicreadingversion5440.89Academicreadingversion5450.91Academicreadingversion5460.91Academicreadingversion5470.91Academicreadingversion5480.90Academicreadingversion5490.89Academicreadingversion5500.89AverageAlphaacrossversions0.90ThefiguresreportedforListeningandReadingmodulesindicatetheexpectedlevelsofreliabilityfortestscontaining40items.Onthebasisofthesereliabilityfigures,anestimateofthestandarderrorofmeasurement(SEM)maybecalculatedforthesemodulesusingthefollowingformula:stisthestandarddeviationofthetestrxx'isthereliabilityofthetestTable1Mean,standarddeviationandstandarderrorofmeasurementofListeningandReading(2011)MeanStdeviationSEMListening6.11.30.390AcademicReading5.91.20.379GeneralTrainingReading5.71.50.424TheSEMshouldbeinterpretedintermsofthefinalbandscoresreportedforListeningandReadingmodules(whicharereportedinhalf-bands).Reliabilityofsubjectively-scoredmodules(WritingandSpeaking)ThereliabilityoftheWritingandSpeakingmodulescannotbereportedinthesamemannerasforReading/Listeningbecausetheyarenotitem-based;candidates'writingandspeakingperformancesareratedbytrainedandstandardisedexaminersaccordingtodetaileddescriptivecriteriaandratingscales.TheassessmentcriteriausedforratingWritingandSpeakingperformancearedescribedintheIELTS2006Handbook.BenchmarkedexamplewritingperformancesandCD-basedspeakingperformancesatdifferentlevelscanb...

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