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The combination of these aspects, alongside the SAT, is a more valid measure of the applicant’s potential for graduation, later social involvement, and generosity (alumni giving) toward the alma mater.
Finally, the most useful instrument is both valid and reliable. It is a moderately reliable predictor of future success and a moderately valid measure of a student’s knowledge in Mathematics, Critical Reading, and Writing.
Second, validity is more important than reliability.
Using the above example, college admissions may consider the SAT a reliable test, but not necessarily a valid measure of other quantities colleges seek, such as leadership capability, altruism, and civic involvement.
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Examples are listed below: is the extent to which an instrument measures what it is supposed to measure and performs as it is designed to perform.There are numerous statistical tests and measures to assess the validity of quantitative instruments, which generally involves pilot testing.The remainder of this discussion focuses on external validity and content validity. Establishing eternal validity for an instrument, then, follows directly from sampling.Some qualitative researchers reject the concept of validity due to the constructivist viewpoint that reality is unique to the individual, and cannot be generalized.These researchers argue for a different standard for judging research quality.
Thus far, we have discussed Instrumentation as related to mostly quantitative measurement.