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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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Classical Test Theory

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  1. Classical Test Theory By ____________________

  2. What is CCT?

  3. X = T + E

  4. What is “true score”?

  5. Assumptions of CTT

  6. Item Analysis Using CTTp – value (difficulty index)

  7. Example How to calculate the difficulty index

  8. discrimination index

  9. ExampleHow to calculate discrimination index

  10. How do you improve a test by conducting the item analysis in CTT?

  11. “Group dependent” item analysis

  12. What is reliability?

  13. Procedures for estimating reliability • Test – retest reliability

  14. Alternate forms reliability

  15. Internal consistency (split-half, KR-20, coefficient alpha)

  16. What is standard error of measurement (SEM)?

  17. SEM is the same for all the examinees because

  18. The formula for SEM is

  19. Example • Reliability = .91 • SD = 10 • Then, SEM is ____________

  20. Limitations of CTT

  21. Conclusion

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