Validating a psychometric instrument

29-Jun-2017 16:08 by 2 Comments

Validating a psychometric instrument - Free sex in bangalore

It is generally accepted that the concept of scientific validity addresses the nature of reality and as such is an epistemological and philosophical issue as well as a question of measurement.

Content related evidence typically involves a subject matter expert (SME) evaluating test items against the test specifications.They also include relationships between the test and measures of other constructs.As currently understood, construct validity is not distinct from the support for the substantive theory of the construct that the test is designed to measure.conclusion or measurement is well-founded and corresponds accurately to the real world.The word "valid" is derived from the Latin validus, meaning strong.This is not the same as reliability, which is the extent to which a measurement gives results that are very consistent.

Within validity, the measurement does not always have to be similar, as it does in reliability.

The validity of a measurement tool (for example, a test in education) is considered to be the degree to which the tool measures what it claims to measure; in this case, the validity is an equivalent to accuracy.

In psychometrics, validity has a particular application known as test validity: "the degree to which evidence and theory support the interpretations of test scores" ("as entailed by proposed uses of tests").

Face validity is an estimate of whether a test appears to measure a certain criterion; it does not guarantee that the test actually measures phenomena in that domain.

Measures may have high validity, but when the test does not appear to be measuring what it is, it has low face validity.

This judgment is made on the "face" of the test, thus it can also be judged by the amateur.