1_17 - Reliability Reliability = Indicator of how...

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Reliability • Reliability = Indicator of how consistently (precisely) the test measures the psychological construct. – Consistency of test results from one administration of the test to another administration (test-retest reliability). – Consistency of randomly chosen two subset of items in the test (split-half reliability). – Consistency of each item to the other items in the test (internal consistency). • Virtually, all psychological measurements are not perfectly reliable. We want to know how reliable the test is. • The measure of reliability is based on what we call “classical true- score test theory”. The Classical True Score Model X = T + E where X is the observed score T is the unobserved true score (fixed) E is the error score (random) (example) • Assume your true score for a specific test is known to be 108. - True score is always unknown, though. • You have obtained 112 on the test. • Then, X = 112, T = 108, and E = 4.
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Observed Score as a Random Variable
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1_17 - Reliability Reliability = Indicator of how...

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