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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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).

Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
References in periodicals archive ?
Under the PP model, selection bias remains a threat to internal validity and the results do not consider the nonenrolled portion for which the intervention has no impact.
Four studies (40%) met QI 6.7, having controlled for threats to internal validity by executing a properly designed single-case design with implementation fidelity.
A third means of strengthening the study's internal validity involved the use of an expert independent researcher (Flick, 2006).
One limitation of the current study was its small sample size as we followed a very stringent patient selection criterion to enhance internal validity.
Table 1: Internal validity of the MCPSAT by item relevance indexes and item difficulty level.
Given the simplicity of this design and its ability to control threats to internal validity, it is surprising that it is not used more often (the Ferrell, 2006, and Luckner, 2006, studies did not identify one study using a regression discontinuity design).
All show relatively high significant correlations, which is a positive indication of acceptable internal validity. A similar approach was used to assess the internal validity of the measures utilized by respondents to limit cyber-attacks; again, the significant relatively high correlations shown in Table 26 indicate that internal validity is assured.
It is desirable to discuss values of internal validity measures in the context of known quality of results.
To briefly remind us, the internal validity is the validity of what we conclude limited to the design, execution, and the conclusions of the particular study we report.
A sample of 257 older adults was recruited for a study that examined the internal validity of the HELP via the Rasch measurement model.