# validity

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## validity

[və′lid·əd·ē]
(mathematics)
Correctness; especially the degree of closeness by which iterated results approach the correct result.

## validity

the extent to which a measure, indicator or method of data collection possesses the quality of being sound or true as far as can be judged. For example, if a psychological measure, such as an intelligence test, is considered to be valid, this means that it is thought to measure what it sets out to measure. If social survey observations are said to have produced valid data, then they are considered to be true reflection of the phenomenon being studied in the population being studied (e.g. projections of voting behaviour), and the survey method could be said to have validity. Compare RELIABILITY.

In practice, in sociology and the social sciences generally, the relation between indicators and measures on the one hand and the underlying concepts they are taken to represent is often contested (see OFFICIAL STATISTICS, MEASUREMENT BY FIAT).

References in periodicals archive ?
14) Likewise, logical validity, as borrowed from modern logic, does not fully account for the role played by inferential necessity in the Prior Analytics.
An expert's view has been taken into consideration for the logical validity of scale.
Logical validity is not the only desirable property of an argument, but it is a condition that must be met before other criteria become relevant.
There is a way of interpreting principles of logical validity represented in semi-formal languages by means of inference-patterns like "P, therefore P"; it is the most natural interpretation when, as usual, we have in mind mathematical applications.
Logical validity A measure of the appropriateness of the logical model in the DSS.
In his new book, which draws significantly on papers published in the last two decades, he discusses the bearing of dialetheism on such key philosophical notions, as truth, negation, rationality, and logical validity.
And logical validity is special because, being independent of external circumstances, it can be assessed by loking at the words and sentences involved and the way they relate to one another.

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