Reliability Flashcards
What is stability reliability? Why is it important?
Measure of repeatability/consistency over time. Could be important for example, in longitudinal research.
How can you assess stability reliability?
Test-retest, correlation of scores
What is internal consistency reliability?
A measure of how well the items on a test measure the same construct or idea
How can you assess internal reliability?
Cronbach’s alpha, split half correlation of scores
What is inter-rater reliability?
Extent to which two or more raters agree.
What is cronbachs alpha?
A measure of how closely related a set of items are as a group. It is a function of the number of test items and the average inter-correlation among the items.
As you add items to a scale, are you more likely to increase or decrease alpha?
Increase. But there may good theoretical reasons not to include such items, even if they do increase alpha.
Is alpha a statistical test?
No. It is a reliability coefficient.
