In psychometrics, validity has a particular application known as test validity: "the degree to which evidence and theory support the interpretations of test scores" ("as entailed by proposed uses of tests"). face validity, construct validity, etc.) described in greater detail below. Validity is based on the strength of a collection of different types of evidence (e.g. The validity of a measurement tool (for example, a test in education) is the degree to which the tool measures what it claims to measure. The word "valid" is derived from the Latin validus, meaning strong. Validity is the main extent to which a concept, conclusion or measurement is well-founded and likely corresponds accurately to the real world. Extent to which a measurement corresponds to reality
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