Measurement is a fundamentally important component of social work research. This entry briefly covers two important notions in psychometrics: reliability and validity. Reliability concerns errors of measurement, and validity concerns the accuracy of the inferences that are made from scores from a measurement procedure. Both norm-referenced and criterion-referenced measurement procedures are discussed.
Keywords: measurement; psychometric theory; reliability; validity; generalizability theory
Article. 1597 words. Illustrated.
Subjects: Social Work Research and Evidence-based Practice
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