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 ?
Downs S, Black N (1998) The feasibility of creating a checklist for the assessment of the methodological quality both of randomised and non-randomised studies of health care interventions.
Methodological quality of all included trials was categorized to low/unclear/high risk of bias ("Yes" for a low of bias, "No" for a high risk of bias, "Unclear" otherwise).
All the studies that were found to be of medium to high methodological quality after critical appraisal were included in the final sort list that was used for data extraction and data analysis of evidence to anwer the review question.
Criterion validity for the MERSQI was demonstrated via the association with global assessment of methodological quality by two independent experts, a three-year citation rate, and impact factor of the publishing journal (Reed et al.
25) Other authors have also noted that the PEDro scale offers a more comprehensive measure of methodological quality in stroke rehabilitation literature compared with the Jadad scale.
All articles that met the inclusion criteria were assessed for methodological quality.
More generally, in the EAP field, there has simply not been enough emphasis on conducting outcome and cost-offset research studies of any kind of methodological quality.
Quality : No validated instrument is available for assessing methodological quality of inter-rater reliability studies.
This overview found that there is a need to improve the methodological quality of future published systematic reviews and there may be a need for better evidence on this topic.
The methodological quality of the gathered RCTs has been evaluated through both the QUOROM (Quality of Reporting of Meta-analyses) and Cochrane Group Spinal column Review guidelines.
Cochrane reviews are systematic reviews that employ rigorous research methods, and have been shown to be of higher methodological quality than other systematic reviews [Jadad et al.