Validity and Reliability

1. 4 types of principles

1.1. Group variability

1.2. Scoring reliability

1.3. Test length

1.4. Item difficulty

2. References Kubiszyn, T. & Borich, G. (2010). Educational testing & measurement: Classroom application and practice (9th ed.). John Wiley & Sons, Inc., Hoboken, NJ.

3. What is it that you are measuring?

3.1. "A valid test measures what it is supposed to."

4. Two types of Criterion-related validity evidence.

4.1. Concurrent

4.1.1. "Concurrent validity evidence is determined by correlating test scores with a criterion measure collected at the same time"

4.2. Predictive

4.2.1. "Predictive validity evidence is determined by correlating test scores with a criterion measure collected after a period of time has passed."

5. Reliability

5.1. "A reliable test will yield stable scores over repeated administrations, assuming the trait being measured has not changed."