Classical test theory (CTT) is one of the most widespread forms of analysis of reliability testing of test scales, which are performed on the test as a whole. In this thesis we will look at the main assumptions of the CTT analysis and the three main models for deriving the reliability coefficient. In the most general case of reliability coefficient, we will use Factor analysis to calculate the necessary coefficients. We will then use the explained concepts and approaches on the data set of the HADS test and calculate its reliability coefficient.
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