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The validity of an instrument is another important issue for the clinician to consider when selecting a tool for use in data collection. Broadly defined, validity refers to the extent to which an instrument measures what it is supposed to be measuring. Although validity is a unitary concept, this article explores three common categories of validity: content, criterion-related, and construct validity.
对于临床医生在选择用于数据收集的工具时，工具的效度是另一个需要考虑的重要问题。广义而言，效度指的是一种工具在多大程度上测量了它应该测量的内容。虽然效度是一个统一的概念，但本文探讨了效度的三个常见类别：内容效度、效标关联效度和结构效度。
