Validity and Reliability
by Sharon Sharon
1. The adequacy of validity evidence depends on both the strength of the validity coefficient and the purpose the test is being used
2. Validity: Does the test measure what it is supposed to measure?
3. Reliability: Does the test yield the same or similar score rankings (all other factors being equal) consistently?
4. Accuracy: Does the test score fairly closely approximate an individual’s true level of ability, skill, or aptitude?
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6.4. Group variability affects the strength of the validity coefficient
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7.2.3. .Reliability refers to the extent to which assessments are consistent
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7.2.5. Another measure of reliability is the internal consistency of the items.
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