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Validity is the main extent to which a concept, conclusion, or measurement is well-founded and likely corresponds accurately to the real world. [1] [2] The word "valid" is derived from the Latin validus, meaning strong.
External validity is the validity of applying the conclusions of a scientific study outside the context of that study. [1] In other words, it is the extent to which the results of a study can generalize or transport to other situations, people, stimuli, and times.
Construct validity concerns how well a set of indicators represent or reflect a concept that is not directly measurable. [1] [2] [3] Construct validation is the accumulation of evidence to support the interpretation of what a measure reflects.
Verification is intended to check that a product, service, or system meets a set of design specifications. [6] [7] In the development phase, verification procedures involve performing special tests to model or simulate a portion, or the entirety, of a product, service, or system, then performing a review or analysis of the modeling results.
This argument is logically valid, but quite demonstrably wrong, because its first premise is false — a street cleaner may have passed, ...
A statement can be called valid, i.e. logical truth, in some systems of logic like in Modal logic if the statement is true in all interpretations. In Aristotelian logic statements are not valid per se. Validity refers to entire arguments. The same is true in propositional logic (statements can be true or false but not called valid or invalid).
Historical rules for basionyms have evolved over time. Prior to 1 January 1953, the requirements for referencing basionyms were less stringent: an indirect reference to a basionym or replaced synonym was sufficient for valid publication of a new combination, name at new rank, or replacement name.
Valid (number format), a universal number format (unum type III) Valid (engraving company), a Brazilian company; VALID (Video Audio Line-up & IDentification), part of the GLITS broadcast television protocol; Validity and liceity (Catholic Church), concepts in the Catholic Church.