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Choosing tests for EEF evaluations – reliability and validity and other issues

Choosing tests for EEF evaluations – reliability and validity and other issues . Steve Higgins & Carole Torgerson s.e.higgins@durham.ac.uk & carole.torgerson@durham.ac.uk School of Education, Durham University. EEF Evaluators Conference, June 2013. The perfect test!.

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Choosing tests for EEF evaluations – reliability and validity and other issues

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  1. Choosing tests for EEF evaluations – reliability and validity and other issues Steve Higgins & Carole Torgerson s.e.higgins@durham.ac.uk & carole.torgerson@durham.ac.uk School of Education, Durham University EEF Evaluators Conference, June 2013

  2. The perfect test! Wonderfully valid … Translation validity Face (weak and strong versions) Content (CVI) Criterion validity Concurrent Predictive Construct-related validity Convergent Discriminant Highly reliable … Internal consistency Inter-item /Item total correlation Split-Half Reliability Cronbach's Alpha (α) Test/Re-test Parallel forms & Split half Inter-rater .. And eminently practical Short Easy to administer to large groups Cheap Quick and easy to mark/ get the data

  3. Other issues • Intervention alignment • Measures what is taught versus a good measure of school learning (predictive validity) • Standardisation • Availability of data • Sampling (compared with intervention focus) • Recency • Poor reliability can increase Type II errors (false negatives)

  4. Diamond ranking Most important Least important

  5. Competing priorities Aligned to intervention Number of items Ease of marking and data entry Time to administer Cost

  6. Other issues (Carole T) • Choice of test(s) • Possible test effects • Blinding • teachers? • intervention designers (developers)? • markers • Teaching to the test • Treatment inherent measures • Developers/teachers attitudes to tests

  7. Discussion • Discuss any of these or other testing issues that have arisen in your evaluation • How can EEF help?

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