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KSAOs
The degree to which observed scores are free from random measurement errors. It is an indication of the stability or dependability of a set of measurements over repeated applications of the measurement procedure
True Score
The average score that an individual would earn on an infinite number of administrations of the same test or parallel versions of the same test
Error score
The hypothetical difference between an observed score and a true score
Validity
The degree to which accumulated evidence and theory support specific interpretations of test scores in the context of the test's proposed use
Content validity
Whether the items on a test appear to match the content or subject matter they are intended to assess; assessed through the judgements of experts in the subject area. A related concept is face validity, which is the degree to which test users or other non-experts believe that the test measures the content area.
Construct validity
The degree to which a test or procedure assesses an underlying theoretical construct it is supposed to measure; assessed through multiple sources of evidence showing that it measures what it purports to measure and not other constructs. For example, an IQ test must measure intelligence and not personality
Criterion-related validity
The relationship between a predictor (test score) and an outcome measure; assessed by obtaining the correlation between the predictor and outcome scores
Predictive validation
Strategies in which evidence is obtained about a correlation between predictor scores that are obtained before an applicant is hired and criterion scores that re obtained at a later time, usually after an applicant is employed
Concurrent validation
Strategies in which evidence is obtained about a correlation between predictor and criteria scores from information that is collected at approximately the same time from a specific group of workers
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