Introduction - Professional Testing

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Test Reliability1Professional Testing Inc. PTI 2006IntroductionReliability is one of the most important elements of test quality . It has to do with theconsistency, or reproducibility, of an examinee's performance on the test. For example, ifyou were to administer a test with high reliability to an examinee on two occasions, youwould be very likely to reach the same conclusions about the examinee's performance bothtimes. A test with poor reliability , on the other hand, might result in very different scores forthe examinee across the two test administrations. If a test yields inconsistent scores, it maybe unethical to take any substantive actions on the basis of the test. There are severalmethods for computing test reliability including test-retest reliability , parallel formsreliability, decision consistency, internal consistency, and interrater reliability . For manycriterion-referenced tests decision consistency is often an appropriate of ReliabilityTest-Retest ReliabilityTo estimate test-retest reliability , you must administer a test form to a single group ofexaminees on two separate occasions.

Test Reliability 1 Professional Testing Inc. © PTI 2006 Introduction Reliability is one of the most important elements of test quality. It has to do with the

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