Test-Retest Reliability
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Category: Software Testing @ OneStopTesting
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URL: http://forum.onestoptesting.com/forum_posts.asp?TID=2714
Printed Date: 01Mar2025 at 5:34am
Topic: Test-Retest Reliability
Posted By: tanushree
Subject: Test-Retest Reliability
Date Posted: 08Oct2007 at 12:13am
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Test-Retest Reliability We estimate test-retest reliability when we administer the same test to the same sample on two different occasions. This approach assumes that there is no substantial change in the construct being measured between the two occasions. The amount of time allowed between measures is critical. We know that if we measure the same thing twice that the correlation between the two observations will depend in part by how much time elapses between the two measurement occasions. The shorter the time gap, the higher the correlation; the longer the time gap, the lower the correlation. This is because the two observations are related over time -- the closer in time we get the more similar the factors that contribute to error. Since this correlation is the test-retest estimate of reliability, you can obtain considerably different estimates depending on the interval. |
