Estimating reliability - PowerPoint PPT Presentation

Validity/Reliability

Validity/Reliability. Reliability. From the perspective of classical test theory, an examinee's obtained test score (X) is composed of two components, a true score component (T) and an error component (E): X=T+E. Reliability.

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2.47k views • 87 slides

Introduction to Classical Test Theory (CTT)

Introduction to Classical Test Theory (CTT). X = T + e. Meaning of X, T, and e. Basic assumptions Parallel tests Reliability Standard Error of Measurement p-value &amp; point-biserial. X = T + e. X = observed score (this is obvious) T = “true” score e = error

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3.05k views • 30 slides

Classical Test Theory

Classical Test Theory. By ____________________. What is CCT?. X = T + E. What is “true score”?. Assumptions of CTT. Item Analysis Using CTT p – value (difficulty index). Example How to calculate the difficulty index. d iscrimination i ndex. Example How to calculate discrimination index.

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529 views • 21 slides

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