To provide such evidence, investigators have borrowed validation strategies from psychologists who for many years have struggled with determining whether questionnaires assessing intelligence and attitudes really measure what is intended.Ĭontent-related: evidence that the items and domains of an instrument are appropriate and comprehensive relative to its intended measurement concept(s), population and use Ĭonstruct-related: evidence that relationships among items, domains, and concepts conform to a priori hypotheses concerning logical relationships that should exist with other measures or characteristics of patients and patient groups andĬriterion-related (for a PRO instrument used as diagnostic tool): the extent to which the scores of a PRO instrument are related to a criterion measure.Įstablishing validity involves examining the logical relationships that should exist between assessment measures. Empirical evidence that PROs measure the domains of interest allows strong inferences regarding validity. Validity has to do with whether the instrument is measuring what it is intended to measure. For the current version, please go to /handbook/current or search for this chapter here. This is an archived version of the Handbook.
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