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META-ANALYSIS

META-ANALYSIS. Dr. Ken Kavale. META-ANALYSIS. Quantitative Research Synthesis “What the research says” Knowledge Accumulation Usable Knowledge. METHODS OF RESEARCH SYNTHESIS. Narrative Review Serial Presentation No Accumulation Findings remain independent and isolated If Accumulated

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META-ANALYSIS

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  1. META-ANALYSIS Dr. Ken Kavale

  2. META-ANALYSIS Quantitative Research Synthesis “What the research says” Knowledge Accumulation Usable Knowledge

  3. METHODS OF RESEARCH SYNTHESIS Narrative Review Serial Presentation No Accumulation Findings remain independent and isolated If Accumulated SUBJECTIVE

  4. QUANTITATIVE REVIEWS Voting Method Box-Score Analysis Studies classified by statistical significance or non-significance What is statistical significance? Publication Bias (“File Drawer Problem”)

  5. META-ANALYSIS Advantages • Uses quantitative (statistical) methods for organizing and extracting information • Eliminates study selection bias – no prejudgments about research quality are made • Makes use of all information – findings are transformed to commensurate expressions of effect magnitude

  6. META-ANALYSIS (con’t) • Detects interactions – study characteristics that may mediate findings are defined and measured, and their covariation is investigated • Seeks general conclusions – practical simplicity OBJECTIVITY VERIFIABILITY REPRODUCABILITY

  7. METHODS OF META-ANALYSIS Scientific Method Formulating Problems Broadly defined “Is Method x effective?” Sampling Literature search - Comprehensive - Published and unpublished

  8. METHODS OF META-ANALYSIS (con’t) Classifying and Coding Studies Study features Data Analysis Effect Size – z score (standard deviation units) __ __ ES =XE– XC SDC

  9. METHODS OF META-ANALYSIS (con’t) Effect Size Interpretation • Overlapping distributions and comparable percentiles • Comparative context • Statistical power – small (.20), medium (.50), large (.80>) • Binomial effect size display (BESD) – practical significance • Common language effect size – research significance

  10. SUMMARY OF META-ANALYSIS BY EFFECT SIZE MAGNITUDE

  11. SUMMARY OF META-ANALYSIS BY EFFECT SIZE MAGNITUDE (con’t)

  12. SUMMARY OF META-ANALYSIS BY EFFECT SIZE MAGNITUDE (con’t)

  13. SUMMARY OF META-ANALYSIS BY EFFECT SIZE MAGNITUDE (con’t)

  14. SUMMARY OF META-ANALYSIS BY EFFECT SIZE MAGNITUDE (con’t)

  15. PERCEPTUAL-MOTOR TRAINING EFFECT SIZE .08

  16. PERCEPTUAL-MOTOR TRAINING (con’t)

  17. PERCEPTUAL-MOTOR TRAINING (con’t)

  18. PERCEPTUAL-MOTOR TRAINING (con’t)

  19. PERCEPTUAL-MOTOR TRAINING (con’t)

  20. PERCEPTUAL-MOTOR TRAINING (con’t)

  21. PERCEPTUAL-MOTOR TRAINING (con’t)

  22. MODALITY-MATCHED INSTRUCTION(Learning Styles) EFFECT SIZE .14

  23. MODALITY-MATCHED INSTRUCTION(Learning Styles) (con’t)

  24. MODALITY-MATCHED INSTRUCTION(Learning Styles) (con’t)

  25. STIMULANT MEDICATION EFFECT SIZE .58 .67

  26. STIMULANT MEDICATION (con’t)

  27. STIMULANT MEDICATION (con’t)

  28. FEINGOLD DIET EFFECT SIZE .12

  29. INTERVENTIONS FOR ADHD Stimulant Medication Feingold Diet Effect SizeEffect Size .63 .12 Treatment Duration Stimulant MedicationFeingold Diet 10 weeks 39 weeks Comparison Stimulant medication better than 5X more effective than the Feingold diet in ¼ the time

  30. SPECIAL CLASS PLACEMENT EFFECT SIZE -.12

  31. SOCIAL SKILLS TRAINING EFFECT SIZE .21 .20

  32. SOCIAL SKILLS TRAINING (con’t)

  33. SOCIAL SKILLS TRAINING (con’t)

  34. SOCIAL SKILLS TRAINING (con’t)

  35. SOCIAL SKILLS TRAINING (con’t)

  36. SOCIAL SKILLS TRAINING (con’t)

  37. SOCIAL SKILLS TRAINING (con’t)

  38. SOCIAL SKILLS TRAINING (con’t)

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