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Most of ResearchGate's users are involved in medicine or biology, [10] [12] though it also has participants from engineering, law, computer science, agricultural sciences, and psychology, among others. [10] ResearchGate published an author-level metric in the form of an "RG Score" since 2012. [15] RG score is not a citation impact measure.
Test validity is the extent to which a test (such as a chemical, physical, or scholastic test) accurately measures what it is supposed to measure.In the fields of psychological testing and educational testing, "validity refers to the degree to which evidence and theory support the interpretations of test scores entailed by proposed uses of tests". [1]
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The validity of a measurement tool (for example, a test in education) is the degree to which the tool measures what it claims to measure. [3] Validity is based on the strength of a collection of different types of evidence (e.g. face validity, construct validity, etc.) described in greater detail below.
The large body of evidence confirms that the VVIQ is a valid and reliable psychometric measure of visual image vividness. In 1995 Marks published a new version of the VVIQ, the VVIQ2 . [ 2 ] This questionnaire consists of twice the number of items and reverses the rating scale so that higher scores reflect higher vividness.
Evidence-based practice in general is based on a very thorough search of the scientific literature and a very thorough selection and analysis of the retrieved literature. A close familiarity with database searching is needed, and library and information professionals have important roles to play in this respect.
Evidence-based education is related to evidence-based teaching, [2] [3] [4] evidence-based learning, [5] and school effectiveness research. [ 6 ] [ 7 ] The evidence-based education movement has its roots in the larger movement towards evidence-based practices , and has been the subject of considerable debate since the late 1990s. [ 8 ]
External validity is the validity of applying the conclusions of a scientific study outside the context of that study. [1] In other words, it is the extent to which the results of a study can generalize or transport to other situations, people, stimuli, and times.