Importance of Validity and Reliability in Assessments

1. Reliability

1.1. " The stability of a test score over repeated administrations." (Kubiszyn, pg. 349)

2. Test –retest

2.1. Does the same test take over and over, by different students yield the same results?

3. Internal consistency

3.1. Split-half or odd–even estimates and item–total correlations

4. Alternate Forms

4.1. Alternate forms of the same test, with a time period given.

5. "Split-half and odd–even estimates divide a test into halves and correlate the halves with one another."(Kubiszyn, pg. 349).

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

7. Types of Validity

7.1. "A valid test measures what it is supposed to measure. "(Kubiszyn, pg. 339) Kubiszyn, Tom. Educational Testing and

8. Criterion-Related Validity Evidence

8.1. concurrent and predictive

9. Content Validity Evidence

9.1. Making sure the content on the test matches the content taught in class.

10. Construct Validity Evidence

10.1. Do the test scores correspond with the outcome predicted?

11. "Concurrent validity evidence is determined by correlating test scores with a criterion measure collected at the same time."(Kubiszyn, pg. 339). "Predictive validity evidence is determined by correlating test scores with a criterion measure collected after a period of time has passed. " (Kubiszyn, pg. 340)