In general more items are better if each one taps a

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In general, more items are better, if each one taps a slightly different aspect of the trait Items are generally additive – each one gives a quantifiable value for a trait, and the average of those items is better than one alone. 1. Administer the survey to a lot of people Helps us determine which items were useful E.g., how well does each item correlate with the total? 1. Now…do the scores predict behavior?
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Item selection Items should be clear and relatively simple Items should discriminate among test takers Items should be inter-correlated But not so highly correlated that they are redundant The total score of the assessment should have a normal distribution
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Reliability Two varieties to know: 1. Internal consistency reliability Split-half reliability The correlation between two halves of a test Cronbach’s coefficient alpha The average of all possible split-half correlations . 80 and above indicates “adequate internal consistency” 1. Test-retest reliability Measures consistency over time
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Validity Construct validity The extent to which a test truly measures a theoretical construct 1. Convergent validity A measure is related to what it should be related to 1. Discriminant validity A measure is not related to what it should not be related to
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Validity Criterion-related validity The measure can predict important outcome criteria Content validity The measure contains items that represent the entire domain of the theoretical construct
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What if they don’t tell the truth? Response sets A bias in responding to test items that is unrelated to the personality characteristic being measured Acquiescence response set Social desirability response set We try to reduce the influence of response sets with reverse coding, neutral wording, and lie scales
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Enough already. What do psychologists actually
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