Measurement-Reliability-Validity - Psych 461

Measurement-Reliability-Validity - Psych 461 - Measurement...

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Measurement Construct, Measures, Reliability and Validity
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Construct The theoretical concept you are interested in measuring/studying E.g., psychopathy, criminogenic beliefs, desistance Measure The instrument/method used to measure a construct E.g., Psychopathy Checklist (PCL-R), CBAS, years without arrest/conviction
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Measure Construct Operationalization Theoretical concept Method of assessment Idea
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Measure Construct Looks like Hannibal L. Psychopathy Head bumps Personality Violate law Criminal
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Validity of Measure Measure <-> Construct The degree to which a variable actually represents what it is supposed to represent How well does the measure (operationalization) actually assess the theoretical construct? Meaning: Is this a meaningful measure of X?
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Evaluating Validity Measure <-> Construct Does it make sense, given theory? (Face validity) Does it correlate with other (very good) measures of the construct?
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