Reliability and validity are often confused, but the terms actually describe two completely different concepts, although they are often closely inter-related. This distinct difference is best summed up with an example:
Reliability is an essential component of validity but, on its own, is not a sufficient measure of validity. A test can be reliable but not valid, whereas a test cannot be valid yet unreliable.
Reliability, in simple terms, describes the repeatability and consistency of a test. Validity defines the strength of the final results and whether they can be regarded as accurately describing the real world.
Reliability and validity are often confused, but the terms actually describe two completely different concepts, although they are often closely inter-related. This distinct difference is best summed up with an example:Reliability is an essential component of validity but, on its own, is not a sufficient measure of validity. A test can be reliable but not valid, whereas a test cannot be valid yet unreliable.Reliability, in simple terms, describes the repeatability and consistency of a test. Validity defines the strength of the final results and whether they can be regarded as accurately describing the real world.
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