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Internal validity is the extent to which a study establishes a trustworthy cause-and-effect relationship between a treatment and an outcome. 1  Internal validity also reflects that a given study makes it possible to eliminate alternative explanations for a finding.

Internal validity is the extent to which a chunk of proof helps a claim about reason and impact, within the context of a particular observation. It is one of the maximum crucial homes of clinical research and is an essential idea in reasoning approximately proof more generally.

Internal validity is decided via how nicely a look at can rule out opportunity factors for its findings (typically, sources of systematic error or 'bias'). It contrasts with outside validity, the extent to which ends up can justify conclusions about other contexts (that is, the volume to which ends up may be generalized).

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