Chapter 5: Reliability of Psychological Tests

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Mean of all possible split-half correlations, corrected by the Spearman-Brown formula

Measurement of a quantity without measurement error

Person's standing on a theoretical variable independent of any particular measurement

Consistency and dependability of test scores

Correlation between two pairs of scores obtained from equivalent halves of a single test

Consistently inflate or deflate test scores

Degree of correlation among all the items on a scale

Alternative to the true score model that estimates sources of variation in test scores