classical test theory by ____________________. what is cct?
Post on 22-Dec-2015
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Classical Test Theory
By____________________
What is CCT?
X = T + E
What is “true score”?
Assumptions of CTT
Item Analysis Using CTTp – value (difficulty index)
Example How to calculate the difficulty index
discrimination index
ExampleHow to calculate discrimination index
How do you improve a test by conducting the item analysis in CTT?
“Group dependent” item analysis
What is reliability?
Procedures for estimating reliability
• Test – retest reliability
• Alternate forms reliability
• Internal consistency (split-half, KR-20, coefficient alpha)
What is standard error of measurement (SEM)?
SEM is the same for all the examinees because
The formula for SEM is
Example
• Reliability = .91• SD = 10• Then, SEM is ____________
Limitations of CTT
Conclusion
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