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A Closed-Form Alternative for Estimating [omega] Reliability under Unidimensionality
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Hancock, Gregory R.; An, Ji – Measurement: Interdisciplinary Research and Perspectives, 2020
As an alternative to Cronbach's [alpha] for estimating scale reliability, McDonald's [omega] has attracted increased attention within the methodological community for its less stringent measurement assumptions. Notwithstanding, [omega] is still seldom used by practitioners, likely due to its unavailability in popular software packages (e.g., SPSS)…
Descriptors: Evaluation, Alternative Assessment, Reliability, Test Reliability
Psychometric Packages in R
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Schumacker, Randall – Measurement: Interdisciplinary Research and Perspectives, 2019
The R software provides packages and functions that provide data analysis in classical true score, generalizability theory, item response theory, and Rasch measurement theories. A brief list of notable articles in each measurement theory and the first measurement journals is followed by a list of R psychometric software packages. Each psychometric…
Descriptors: Psychometrics, Computer Software, Measurement, Item Response Theory