Validity, the accuracy of a conclusion or inference, is central to research, measurement, and evaluation. If inferences made from the results of a test or measure are not considered valid, it suggests that the test may not be measuring what is supposed to be measured. Several sources of evidence can be used to establish validity. One source of validity evidence is criterion-related evidence. Criterion-related validity represents the relationship between scores on a test or measure and a criterion, or outcome, variable. Validity coefficients are correlations that quantify this relationship; thus, they are essential for establishing criterion-related validity.
Validity coefficients can be described with respect to direction and magnitude and can vary between −1 and +1. A validity coefficient of 0 indicates that there is ...
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