validity

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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.

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.

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.
References in periodicals archive ?
Accordingly, if the aim is to provide a faithful rendering of Aristotle's arguments, logical validity misses the mark.
(18) It is certain that Aristotle does not offer "an explicit analysis" of inferential necessity, understood as logical validity. It is also true that inferential necessity may be regarded as "primitive," in so far as it postulates a complete deduction by definition.
Logicians claim that logical validity is totally compatible with inferential necessity, in so far as validity underlines the form of an argument, independently of its content.
The crucial dilemma for logical validity lies in its incapacity to grasp the relevance of Aristotle's distinction between complete and incomplete deductions.
A careful study of the text shows how Aristotle equates inferential necessity with complete deducibility (and not with deducibility), and those who focus on logical validity neglect this view.
The deeper objection is that there is no philosophical justification for ascribing any special status to logical validity "in the narrow sense".
(11) It is mildly paradoxical that the fact that this mistake is so widespread should be explainable by the extraordinary influence of Quine's views on analyticity and logical validity. For an account of the failure of the Tractatus's project from the viewpoint outlined in the main text, see Garcia-Carpintero (1996a, Ch.