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Teaching heterogeneity thru a story

Teaching heterogeneity thru a story. Professor of Neurology Director, Clinical Epidemiology Unit All India Institute of Medical Sciences, New Delhi Contributing Editor, Cochrane Stroke Review Group. Students’ union writes to the Dean. There has been a problem with the examination results

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Teaching heterogeneity thru a story

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  1. Teaching heterogeneity thru a story Professor of Neurology Director, Clinical Epidemiology Unit All India Institute of Medical Sciences, New Delhi Contributing Editor, Cochrane Stroke Review Group

  2. Students’ union writes to the Dean • There has been a problem with the examination results • Some students who failed were actually good • Some students who passed were not good at all.

  3. Dean appoints a committee • To examine whether there is really a need to investigate this? • If so, then investigate the problem.

  4. Overview of the examination • Written exam: Full marks 100 • Practical: Full marks 100 • Oral (Viva-voce): Full marks 100 • Pass marks: 50% of total overall

  5. FOUR PATTERNS

  6. Patterns to investigate • Patterns 2 and 4 • Why? • Unacceptable because the marks are dissimilar across the various evaluations. • Acceptable when the marks are similar. • Any scientific word (synonym) for similarity?

  7. Acceptability depends on • similarity across evaluations • Similarity = homogeneity • Dissimilarity = heterogeneity

  8. How does it fit with EBP? • Meta-analysis is a study of studies. • Nothing but taking out an average from two or more measurements. • Each study evaluates and measures the effect. • Summary effect measure is the average. • Acceptable if there is homogeneity across the studies • If there is heterogeneity, investigate.

  9. Take home message • In a meta-analysis • Results are acceptable if there is homogeneity • Need to investigate if there is heterogeneity

  10. Thank You

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