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Missing Value Reason
A specific reason explaining why a meaningful value is not available. A meaningful value answers the question posed by a Data Element Concept. In contrast, a Missing Value Reason answers the implicit question "Why is there no 'meaningful' value?", when there is none. (NCI Thesaurus)
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Not existing; not able to be found.
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The text and/or code that describes the rationale behind why an activity is not done.
