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Validity

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to make your test acceptable--it needs to be valid.

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Validity

  1. 1. By
  2. 2. Why evaluate tests? • To make sure that a test measures the skill, trait, or attribute it is supposed to measure • To yield reasonable consistent results for the same individual • To measure with reasonable degree of accuracy
  3. 3. A good test must first of all be valid.
  4. 4. • Refers to the extent to which a test measures what it purports to measure. • Does the measure what it is suppose to measure?
  5. 5. • CONTENT-RELATED VALIDITY - the adequacy and representativeness of learning outcomes to be measured. - is assessed by systematically comparing a test item with instructional objectives to see if they match. Content validity evidence does not yield a numerical estimate of validity evidence.
  6. 6. • CRITERION-RELATED VALIDITY –Is established by correlating test scores with an external standard or criterion to obtain a numerical estimate of validity evidence.
  7. 7. 1. Predictive Validity- involves the use of criterion and a predictor. - determined by correlating test scores with a criterion measure collected after a period of time passed. 2. Concurrent Validity- use the general average of the students. - determined by correlating test scores with a criterion measure collected at the same time.
  8. 8. • CONSTRUCT-RELATED VALIDITY - Refers to how well a performance on a particular set of tasks or components can be explained in terms of some psychological construct or trait. -determined by finding whether the test results corresponds with scores on other variables as predicted by some rationale or theory.
  9. 9. • CONSTRUCT-RELATED VALIDITY - Refers to how well a performance on a particular set of tasks or components can be explained in terms of some psychological construct or trait. • DISCRIMANT VALIDITY - shows a certain psychological test correlated little or not at all with the construct under consideration.
  10. 10. • The adequacy of validity evidence depends on both the strength of the validity coefficient and the purpose the test is being used for. • Group variability affects the strength of the validity coefficient. • Validity Coefficient should be considered in terms of the relevance and the reliability of the criterion or standard. – A correlation coefficient Principles In Interpreting Validity

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