Chapter 5 Flashcards
Is a measure of the amount of the attribute that the test is designed to measure.
True score
Measurements may be precise but not accurate.
What type of error is this?
Systematic error
Measurements lack precision but cluster around accurate value.
What type of error is this?
Random error
What is a reliability coefficient?
The correlation between the two sets of test results- aim for correlation of 1
What is test-retest method ?
A test developer gives the same test to the same group of test takers on different occasions
Occur when test takers benefit from taking the test the first time (practice), which enables them to solve problems more quickly and correctly the second time.
What effect is this? What it is related to?
Practice effect- test re-test method
What is the alternative form method?
3pts
- Alternate forms: the test developer creates two different forms of the test
- Difficult to be equivalent
- Order effects: changes in the test scores resulting from the order in which the tests were taken
What is the internal consistency method?
- A measure of how related the items on the test are to one another
- Split-half method: Divide the test into halves and then compare the individual test scores on the first half with the set of individual test scores on the second half
Measuring only one trait or characteristic.
measuring more than one trait or characteristic
What type of tests are these?
- Homogenous tests
- Heterogenous tests
What is scorer reliability or interscorer agreement?
The amount of consistency among scorer’s judgments
Whether each clinician was consistent in the way he or she assigned scores from test to test.
Intrascorer reliability
What are factors that influence reliability?
6pts
- Test length
- Homogeneity
- Test-retest interval
- Test administration
- Grading
- Cooperation of candidates
