Abstract
Derivation of the CTT equations of Chap. 3 and coefficient α. In particular, derivation of covariance, standard error of measurement, equation for predicting the true score from the observed score and coefficient α.
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Andrich, D., Marais, I. (2019). Derivation of Classical Test Theory Equations and Coefficient α. In: A Course in Rasch Measurement Theory. Springer Texts in Education. Springer, Singapore. https://doi.org/10.1007/978-981-13-7496-8_25
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DOI: https://doi.org/10.1007/978-981-13-7496-8_25
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