Keywords: Scales
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Journal Articles
Library Review (2017) 66 (6-7): 442–455.
Published: 05 September 2017
.... The psychometric analyses are based on the classical test theory (CTT) or the more modern item response theory (IRT). Key concepts in the CTT are reliability and validity. The IRT models the relationship between latent traits and responses to test items. Reporting psychometric qualities of the measurement scale...

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