Abstract
When faced with the task of responding to a per sonality questionnaire, an individual may respond with a number of strategies or test-taking attitudes. Among these, deceptive (fake) and disengaged (random) atti tudes are of particular interest, for these can poten tially mislead and misinform test users. A two-stage model was devised to detect deceptive and disengaged protocols on the California Psychological Inventory. Using parameters from signal detection theory, this model is found to be highly sensitive in detecting in- validity. Index terms: California Psychological In ventory, expected utility, faking on personality inven tories, personality assessment, random response patterns, signal detection theory.
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