For instance, a test predicted on the construct of affability.
If a factor completely changes over time, then the retest, although it may be asking the same material, may not apply anymore.Ĭonstruct validity is an idea or variable designed to predict behavior or allow for certain findings to be made based on the test administer or questions being answered (Cohen & Swerdlik, 2010). Outlying factors can also affect the retest aspect. Sometimes, characteristics being tested may fluctuate over time, thus rendering the test-retest reliability invalid- since it will not yield the same results on the retest aspect if the testing factor has changed (Cohen & Swerdlik, 2010). Researchers believe this is a strength because they are able to see factual numbers over a period of time (Cohen & Swerdlik, 2010). Scores are measured based on the 1 st and 2 nd attempt to look at the correlation. Researchers tend to gravitate towards this method because it refers to consistency within test scores. One of the strengths of test/retest is that this tool is able to measure over a stable period of time and gives an estimated stability to the overall picture (Cohen & Swerdlik, 2010).
An inappropriate administering of this test occurs when a person’s abilities skew test results (such as data retention, tiredness, repetitive simulated testing, intent) (Cohen & Swerdlik, 2010). The reliability of this test is assessed when querying “reaction time or perceptual judgments” (Cohen & Swerdlik, 2010, p. Test/retest administrations occur at two different times with the same test presented to the same group (Cohen & Swerdlik, 2010). Then prepare a description of each test’s strengths and a description of each test’s weaknesses. New York, NY: McGraw-Hill.Ĭompleted by: Deanna Shelby, Shernard Robinson, & Julia Carlson for PSYCH/525įor each of the tests of reliability and validity listed on the matrix, prepare a description of test’s application and under what conditions these types of reliability would be used as well as when it would be inappropriate. Psychological testing and assessment: An introduction to tests and measurements (7th ed.).
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