The extent to which a test measures and what it claims to measure. The issue then follows as to why this is the case and also brings out questions concerning the various perspectives on the issue resulting from different methods applied by numerous researchers.Īdditional Information Difference between validity and reliability.This criterion is most instructive when it is not fulfilled as viewed by various researchers. ![]() Synchronic reliability is the consistency of results collected at the same moment in time but by using different instruments.The issue here is the precondition that the phenomenon under study in itself may not undergo any changes so that the criterion remains effective.Diachronic reliability is understood as the stability of measurements or observations in their temporal course.However, many researchers and authors have rejected this approach of defining reliability as misleading and trivial. ![]() ![]() Quixotic reliability can be viewed as an attempt to measure how far a particular method can continuously lead to the same measurements and final results. ![]() The reliability of a statistical analysis conveys that a methodology being used for interpreting data is consistent and would give uniform results every time it is used.
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