A data item that refers to the extent to which a concept conclusion or measurement is well-founded and corresponds accurately to the real world.

This is just here as a test because I lose it

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Here is another definition: Validity is the extend to which an observation reflects the "truth" of the phenomenon being measured. Reference: http://www.uptodate.com/contents/glossary-of-common-biostatistical-and-epidemiological-terms

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WEB: http://www.uptodate.com/contents/glossary-of-common-biostatistical-and-epidemiological-terms

http://en.wikipedia.org/wiki/Validity_(statistics)

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Yongqun He