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 ?
Does a finger cuff gain construct validity by being shown to produce blood pressure readings that correlate with those made by an arm cuff sphygmomanometer?
The example is troubling because it implies that an enterprise must have prior audit experience from which it may assess the validity of each new research and experimentation project and determine the best estimate of the amount of tax benefit for each project.
There was a focus on the issue of cultural validity and cultural specificity in career assessment.
Regardless of its validity or reliability, polygraph testing offers investigators another tool they can employ in interviews to help them obtain additional valuable information.
Some researchers support their validity (Greenwald, 1997), but some challenge their validity and usefulness.
The power of attorney is a useful and convenient tool in the closing process when adequate precautions are taken to ensure the validity of the instrument and to protect the interest of the grantor of the power.
Validity and reliability of a questionnaire on fecundability.
The editors and contributors are to be commended for addressing narrowly defined topics and beginning a discussion of larger, broader themes: historical authority and validity, early modern perceptions of reality and certainty.
Generally the calibration validity conditions are either those specified in the definition of the measurand or are "extended conditions.
Powell said he notified Darcy because she recently questioned the validity of TMC's federal mining contract, as Curtis had done in their 1997-98 court battle.
An understanding of their existing strengths, potentials, limitations, and weaknesses is essential, as well as a systematic analysis of their validity as predictors of value for various population/ sub-population applications.
Study after study, however, has disproved the validity of that reason.