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 ?
This practice is questionable, as some criteria could be considered of higher importance to internal validity than others.
It is clear that two samples are taken practically from different populations, which completely spoils the internal validity.
As a result, they would fall toward the universalistic end of the scope continuum and thus the use of student samples in laboratory-based simulations should pose few problems, especially in studies designed to explore the internal validity of predicted relationships.
The one group pretest-posttest design is flawed by several additional internal validity threats not discussed here.
At this point, the internal validity (control) versus external validity (generalizability) problem becomes critical.
The internal validity for the honors students' surveys was "excellent.
Wells and others have thus equated the efficacy trial with greater internal validity, and effectiveness trials with greater external validity (Wells, 1999; Donenberg et al.
Wilcoxon Signed Rank Tests were used to evaluate the internal validity of the analysis with the assumption that children who participated in the 'Healthier Me' program twice would have improved nutrition and fitness goals.
Results of this study with regard to the internal validity of the VR Driving Simulator were impressive: participants clearly committed more driving errors while under the "drunk driving" condition and also showed poorer performance on the divided attention task.
He covers the essential elements of life history research, describes how to design this type of study, and examines issues related to organization insiderness and internal validity and textual authority.
Internal validity refers to whether the observed change in the dependent (outcome) variable is due to the independent variable and only the independent variable.