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 ?
7, having controlled for threats to internal validity by executing a properly designed single-case design with implementation fidelity.
These results show that the scale behaved as expected and had internal validity when administered to the population of PLHA.
A third means of strengthening the study's internal validity involved the use of an expert independent researcher (Flick, 2006).
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).
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.
are grounded in maximizing the internal validity of an SCRD and demonstrating efficacy through multiple replications of results with a participant.
We expect this overview to be of interest to researchers, manuscript reviewers, and grant reviewers seeking to improve the rigor and internal validity of comparative effectiveness research studies using nonrandomized study designs.
Internal validity implies the researcher has conducted a reliable study where results hold within the study itself, while external validity is generally what the public as a whole is interested in: Can these results apply outside of the study itself, and what are the broader implications?
GS (2014) devote considerable space to describing the internal validity of the RATE instrument and tout its many strengths in comparison with other instruments used in the Measures of Effective Teaching (MET) project (for a review of this research, see Kane, Kerr, & Pianta, 2014).
Finally, whilst baseline demographic and clinical characteristics of the patients were similar, there were significant differences in some of the surgery factors, including duration of operation, which may have influenced the internal validity of the results.
Internal validity describes the degree to which alternative explanations can be ruled out.