Reliability from α to ω: A tutorial

Psychological Assessment
William Revelle, David M Condon

Abstract

Reliability is a fundamental problem for measurement in all of science. Although defined in multiple ways, and estimated in even more ways, the basic concepts seem straightforward and need to be understood by practitioners as well as methodologists. Reliability theory is not just for the psychometrician estimating latent variables, it is for everyone who wants to make inferences from measures of individuals or of groups. For the case of a single test administration, we consider multiple measures of reliability, ranging from the worst (β) to average (α, λ3) to best (λ4) split half reliabilities, and consider why model-based estimates (ωh, ωt) should be reported. We also address the utility of test-retest and alternate form reliabilities. The advantages of immediate versus delayed retests to decompose observed score variance into specific, state, and trait scores are discussed. But reliability is not just for test scores, it is also important when evaluating the use of ratings. Estimates that may be applied to continuous data include a set of intraclass correlations while discrete categorical data needs to take advantage of the family of κ statistics. Examples of these various reliability estimates are given using state and trait...Continue Reading

Citations

Sep 12, 2020·Journal of Clinical Child and Adolescent Psychology : the Official Journal for the Society of Clinical Child and Adolescent Psychology, American Psychological Association, Division 53·Rebecca G EtkinWendy K Silverman
May 26, 2020·Multivariate Behavioral Research·Eduardo Garcia-GarzonLuis E Garrido
May 24, 2020·The ISME Journal·Ashish A MalikSteven D Allison
Nov 20, 2020·Applied Neuropsychology. Child·Pedro S R MartinsMarcela Mansur-Alves
Dec 10, 2020·PloS One·Gwendolyn GardinerUNKNOWN Members of the International Situations Project
Jan 15, 2021·Journal of Affective Disorders·Eli R LebowitzWendy K Silverman
Oct 30, 2020·International Journal of Environmental Research and Public Health·Guido CorradiJuan Ramón Barrada
Mar 20, 2021·Journal of Clinical Child and Adolescent Psychology : the Official Journal for the Society of Clinical Child and Adolescent Psychology, American Psychological Association, Division 53·Rebecca G EtkinWendy K Silverman
Mar 24, 2021·Health & Social Care in the Community·Sha LiJanet Yuen Ha Wong
Apr 10, 2021·Frontiers in Psychology·Robert N CollinsSarah S Schywiola
May 8, 2021·Journal of Psychiatric Research·Deon Tullett-PradoTrent Anthony Footitt
Feb 10, 2021·Annual Review of Clinical Psychology·Anthony J Rosellini, Timothy A Brown
May 22, 2021·Frontiers in Psychology·Andrew T JebbLouis Tay
May 23, 2021·Journal of Anxiety Disorders·Thomas ArmstrongKean Hsu
Jun 24, 2021·Globalization and Health·Davide PiaggioLeandro Pecchia
Jul 1, 2021·IScience·Jurgis KarpusOphelia Deroy
Oct 19, 2021·Frontiers in Psychology·M Zachary RosenthalLisalynn D Kelley

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