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Test Reliability—Basic Concepts

Test reliability Basic Concepts Samuel A. LivingstonJanuary 2018 Research Memorandum ETS RM 18-01 ETS Research Memorandum SeriesEIGNOR EXECUTIVE EDITORJ ames CarlsonPrincipal PsychometricianASSOCIATE EDITORSB eata Beigman KlebanovSenior Research ScientistHeather BuzickSenior Research ScientistBrent BridgemanDistinguished Presidential AppointeeKeelan EvaniniResearch DirectorMarna Golub-SmithPrincipal PsychometricianShelby HabermanDistinguished Research Scientist, EdusoftAnastassia LoukinaResearch ScientistJohn MazzeoDistinguished Presidential AppointeeDonald PowersPrincipal Research ScientistGautam PuhanPrincipal PsychometricianJohn SabatiniManaging Principal Research ScientistElizabeth StoneResearch ScientistRebecca ZwickDistinguished Presidential AppointeePRODUCTION EDITORSKim FryerManager, Editing ServicesAyleen GontzSenior EditorSince its 1947 founding, ETS has conducted and disseminated scientific research to support its produc

often affects its interrater reliability. • Explain what “classification consistency” and “classification accuracy” are and how they are related. Prerequisite Knowledge . This guide emphasizes concepts, not mathematics. However, it does include explanations of some statistics commonly used to describe test reliability.

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