Why you need 50 people in eye tracking studies

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  • macieklipiec macieklipiec 2 days ago
    I have a question: how many seconds the page was displayed to participants?
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Why you need 50 people in eye tracking studies - Presentation Transcript

  1. www.realeyes.it The f ollowing slides show how many participants are needed to get a reliable visual analysis of a web page
  2. 1 Large improvements in data quality
  3. Large improvements in data quality 2
  4. Large improvements in data quality 3
  5. Large improvements in data quality 4
  6. Large improvements in data quality 5
  7. Large improvements in data quality 8
  8. Large improvements in data quality 10
  9. Large improvements in data quality 12
  10. Large improvements in data quality 15
  11. Moderate improvements in data quality 17
  12. Moderate improvements in data quality 20
  13. Moderate improvements in data quality 22
  14. Moderate improvements in data quality 25
  15. Moderate improvements in data quality 27
  16. Moderate improvements in data quality 30
  17. Moderate improvements in data quality 32
  18. Small improvements in data quality 35
  19. Small improvements in data quality 37
  20. Small improvements in data quality 40
  21. Small improvements in data quality 42
  22. Small improvements in data quality 45
  23. Small improvements in data quality 47
  24. Small improvements in data quality 53
  25. Some claim 8 people are enough to analyze visual attention. Following slides show random sets of 8 people from the same study shown on previous slides.
  26. 8 people Sample A
  27. 8 people Sample B
  28. 8 people Sample C
  29. 8 people Sample D
  30. 8 people Sample E
  31. Heatmaps of random 8 people out of all 53 participants were very different. It means sample of 8 can give a very misleading picture of true visual attention.
  32. Others claim 15 people are enough for visual analysis. How about that?
  33. 15 people Sample A
  34. 15 people Sample B
  35. 15 people Sample C
  36. 15 people Sample D
  37. Variation is still too large for samples of 15 people. What about samples of 30?
  38. 30 people Sample A
  39. 30 people Sample B
  40. 30 people Sample C
  41. CONCLUSION Reliable visual analysis demands samples larger than 30 people

James BreezeJames Breeze, 2 years ago

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