validity

[vah-lid´ĭ-te]

the extent to which a measuring device measures what it intends or purports to measure.

construct validity the degree to which an instrument measures the characteristic being investigated; the extent to which the conceptual definitions match the operational definitions.

content validity verification that the method of measurement actually measures what it is expected to measure; see also face validity.

external validity the extent to which study findings can be generalized beyond the sample used in the study.

face validity a type of content validity, determining the suitability of a given instrument as a source of data on the subject under investigation, using common-sense criteria.

internal validity the extent to which the effects detected in a study are truly caused by the treatment or exposure in the study sample, rather than being due to other biasing effects of extraneous variables.

predictive validity the effectiveness of one set of test or research results as a predictor of the outcome of future experiments or tests.

va·lid·i·ty

(vă-lid'i-tē),

An index of how well a test or procedure in fact measures what it purports to measure; an objective index by which to describe how valid a test or procedure is.

Farlex Partner Medical Dictionary © Farlex 2012

methodological quality

The extent to which the design and conduct of a trial are likely to have prevented systematic errors (bias). Variation in quality can explain variation on the results of trials included in a systematic review. Rigourously designed (better quality) trials are more likely to yield results that are closer to the “truth” (i.e., unbiased).

va·lid·i·ty

(vă-lid'i-tē)

Truthfulness; the ability of a test to measure correctly as intended.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

validity

The extent to which a measurement correctly measures what it is supposed to measure or to which extent the findings of an investigation reflect the truth. In health sciences, validity is commonly assessed by determining the sensitivity and specificity factors. See reliability; sensitivity; specificity.

va·lid·i·ty

(vă-lid'i-tē)

Index of how well a test or procedure in fact measures what it purports to measure; an objective index by which to describe how valid a test or procedure is.

Medical Dictionary for the Dental Professions © Farlex 2012

Mentioned in

References in periodicals archive

The results section below includes the four phases of psychometric testing used to assess the inter-rater reliability, goodness of fit, internal consistency, and external validity of the SNQ and SNA.

The development of the spiritual narrative questionnaire

RATE has no known external validity as its use in live classrooms has yet to be demonstrated.

Rating teachers cheaper, faster, and better: not so fast

However, the deeper essence of criticisms such as Levitt and List (2007) is the external validity of the results.

On the external validity of laboratory tax compliance experiments

In order to find evidence of external validity for the scale, a stepwise linear regression analysis (Table 4) was carried out using burnout as the dependent variable and the thwarting of the competence, autonomy, and relatedness needs as the independent variables.

Adaptation and validation of the psychological need thwarting scale in Spanish physical education teachers

Only variables with statistically significant differences were considered as predictor candidates--reliability reporting, threats to internal validity, threats to external validity, fading, and scaffolding intervention.

A pilot meta-analysis of computer-based scaffolding in STEM education

Internal and External Validity. In: Cambridge Handbook of Experimental Political Science.

Cass R. Sunstein, "Choosing not to Choose: Understanding the Value of Choice," Oxford University Press, New York (2015)

were study participants recruited in an appropriate way?), but also some on external validity (e.g.

Some notes on critical appraisal of prevalence studies: comment on: "the development of a critical appraisal tool for use in systematic reviews addressing questions of prevalence"

4- Generalizability'Generalizability' or 'External Validity' of the study means the extent to which the results of the current study/clinical trial can be generalized to those similar in characteristics to the study population.

Clinical trials " discussing your findings

First, the accuracy and external validity of the prediction models should be tested in contemporary cohorts of patients.

Intriguing results-questions remain

Although there would seem to be limited, external validity in extrapolating these study findings to the Caribbean given that its study population had a 25% prevalence of vasectomy and was constituted of mostly professional, Caucasian men, the study findings are actually relevant for the area in a number of ways.

Vasectomy and prostate cancer: the controversy reignited

However, there has been a lamentable tendency of researchers to stress the strong internal validity of experiments and downplay the fact that they often have weak external validity. (An analysis is said to have internal validity if its findings about the study population are credible.

Evidence-driven policy