PSYC37H3 Chapter Notes - Chapter 4: Takers, Conceptual Framework, Internal Consistency
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The standard error of measurement tells us, on the average, how much a score varies from the true score. Models of reliability: the reliability coefficient is the ratio of the variance of the true score on a test to the variance of the observed scores. Sources of error: an observed score many differ from a true score for many reasons, such as situational factors, test reliability is usually estimated in one of three ways, test-retest method. Measures consistency of the results when the test is administered on different occasions: parallel forms. Evaluate the test across different forms of the test. Examine how people perform on similar subsets of items selected form the same form of the measure. If the two administrations of the test are close in time, there is a relatively great risk of carryover and practice effects. In split-half reliability, a test is given and divided into halves that are score separately.