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XebiCon'18 - Comment fausser l'interprétation de vos résultats avec des dataviz

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Une Data Visualisation permet en un seul coup d’œil de véhiculer des résultats (d'analyse). Au travers de contre-exemples bien choisis, nous allons voir les nombreux pièges qui nuisent à la lisibilité et l'interprétation des données et comment choisir la bonne représentation pour faire passer vos idées.

Par Romain Sagean, Data Engineer chez Xebia

Toutes les informations sur xebicon.fr

Published in: Technology
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XebiCon'18 - Comment fausser l'interprétation de vos résultats avec des dataviz

  1. 1. @Xebiconfr #Xebicon18 @scauglog Build the future Comment fausser l’interprétation de vos résultats avec des DataViz Romain Sagean, Développeur Xebia 1
  2. 2. @Xebiconfr #Xebicon18 @scauglog Qui suis-je ? Scauglog (Romain Sagean) Développeur, Xebia @scauglog 2
  3. 3. @Xebiconfr #Xebicon18 @scauglog Table Simple but effective 3
  4. 4. @Xebiconfr #Xebicon18 @scauglog Data 2012 April 132 August 63 December 206 February 31 January 132 July 100 June 119 March 47 May 62 November 112 October 245 September 88 4
  5. 5. @Xebiconfr #Xebicon18 @scauglog Table ● Value ● Mnemonic Empan = 7 ● Accurate 2012 April 132 August 63 December 206 February 31 January 132 July 100 June 119 March 47 May 62 November 112 October 245 September 88 5
  6. 6. @Xebiconfr #Xebicon18 @scauglog Table ● Alphabetical Order is the worst 2012 April 132 August 63 December 206 February 31 January 132 July 100 June 119 March 47 May 62 November 112 October 245 September 88 6
  7. 7. @Xebiconfr #Xebicon18 @scauglog Table ● Alphabetical Order is the worst ● Logical Order could be Great 2012 January 132 February 31 March 47 April 132 May 62 June 119 July 100 August 63 September 88 October 245 November 112 December 206 7
  8. 8. @Xebiconfr #Xebicon18 @scauglog Table ● Alphabetical Order is the worst ● Logical Order could be Great ● Sorting value instead of Label is better 2012 October 245 December 206 April 132 January 132 June 119 November 112 July 100 September 88 August 63 May 62 March 47 February 31 8
  9. 9. @Xebiconfr #Xebicon18 @scauglog Line Chart What? Data is evolving! 9
  10. 10. @Xebiconfr #Xebicon18 @scauglog Line Chart ● Evolution ● Angle ● X axis = cause ● Y axis = effect 10
  11. 11. @Xebiconfr #Xebicon18 @scauglog 11
  12. 12. @Xebiconfr #Xebicon18 @scauglog Line Chart ● Bold line decrease effect 12
  13. 13. @Xebiconfr #Xebicon18 @scauglog Line Chart ● Bold line decrease effect ● Sum all category to show an increase 13
  14. 14. @Xebiconfr #Xebicon18 @scauglog Line Chart ● Bold line decrease effect ● Sum all category to show an increase ● Plot incomplete category to show a decrease 14
  15. 15. @Xebiconfr #Xebicon18 @scauglog Line Chart ● Bold line decrease effect ● Sum all category to show an increase ● Plot incomplete category to show a decrease 15
  16. 16. @Xebiconfr #Xebicon18 @scauglog Line Chart ● Bold line decrease effect ● Sum all category to show an increase ● Plot incomplete category to show a decrease ● 3D shiny and misleading 16
  17. 17. @Xebiconfr #Xebicon18 @scauglog Bar Chart Not as good as chocolat bar’s 17
  18. 18. @Xebiconfr #Xebicon18 @scauglog Bar Chart ● Comparison ● Group Dimension to Compare 18
  19. 19. @Xebiconfr #Xebicon18 @scauglog 19
  20. 20. @Xebiconfr #Xebicon18 @scauglog Bar Chart ● Don’t start at Zero to show a greater difference between bar 20
  21. 21. @Xebiconfr #Xebicon18 @scauglog Bar Chart ● Don’t start at Zero to show a greater difference between bar 21
  22. 22. @Xebiconfr #Xebicon18 @scauglog Bar Chart ● Don’t start at Zero to show a greater difference between bar ● Scale Must not be cut 22 shop 1 shop 2
  23. 23. @Xebiconfr #Xebicon18 @scauglog Bar Chart ● Don’t start at Zero to show a greater difference between bar ● Scale Must not be cut 23 shop 1 shop 2
  24. 24. @Xebiconfr #Xebicon18 @scauglog Bar Chart ● Don’t start at Zero to show a greater difference between bar ● Scale Must not be cut 24 shop 1 shop 2
  25. 25. @Xebiconfr #Xebicon18 @scauglog Bar Chart ● Don’t start at Zero to show a greater difference between bar ● Scale Must not be cut ● 3D you will never get the right number 25
  26. 26. @Xebiconfr #Xebicon18 @scauglog Bar Chart ● Don’t start at Zero to show a greater difference between bar ● Scale Must not be cut ● 3D you will never get the right number 26
  27. 27. @Xebiconfr #Xebicon18 @scauglog Line VS Bar 27
  28. 28. @Xebiconfr #Xebicon18 @scauglog Line VS Bar 28
  29. 29. @Xebiconfr #Xebicon18 @scauglog Line VS Bar 29
  30. 30. @Xebiconfr #Xebicon18 @scauglog Line VS Bar 30
  31. 31. @Xebiconfr #Xebicon18 @scauglog Line VS Bar 31
  32. 32. @Xebiconfr #Xebicon18 @scauglog Pie Chart Yes it’s useful 32
  33. 33. @Xebiconfr #Xebicon18 @scauglog Pie Chart ● Composition ● Lot of value 33
  34. 34. @Xebiconfr #Xebicon18 @scauglog Pie Chart ● Should be 100% 34
  35. 35. @Xebiconfr #Xebicon18 @scauglog Pie Chart ● Should be 100% 35
  36. 36. @Xebiconfr #Xebicon18 @scauglog Pie Chart ● Should be 100% ● To determine percent people use: ○ outer arc (50%) ○ area (25%) ○ angle (25%) 36
  37. 37. @Xebiconfr #Xebicon18 @scauglog Pie Chart ● Should be 100% ● To determine percent people use: ○ outer arc (50%) ○ area (25%) ○ angle (25%) ● 3D? oh god no, not again 37
  38. 38. @Xebiconfr #Xebicon18 @scauglog Dimension how many dimension can you plot without using 3D perspective? 38
  39. 39. @Xebiconfr #Xebicon18 @scauglog Dimension 39 1
  40. 40. @Xebiconfr #Xebicon18 @scauglog Dimension 40 1 2
  41. 41. @Xebiconfr #Xebicon18 @scauglog Dimension 41 1 2 3
  42. 42. @Xebiconfr #Xebicon18 @scauglog Dimension 42 1 2 3 4
  43. 43. @Xebiconfr #Xebicon18 @scauglog Dimension 43 1 2 3 4 5?
  44. 44. @Xebiconfr #Xebicon18 @scauglog Color Hopefully someone else problem 44
  45. 45. @Xebiconfr #Xebicon18 @scauglog Color ● 8% of men are color blind 45
  46. 46. @Xebiconfr #Xebicon18 @scauglog Color ● 8% of men are color blind ● Respect existing convention ○ no data = grey 46
  47. 47. @Xebiconfr #Xebicon18 @scauglog Color ● 8% of men are color blind ● Respect existing convention ○ no data = grey ○ banana = yellow 47
  48. 48. @Xebiconfr #Xebicon18 @scauglog Color ● 8% of men are color blind ● Respect existing convention ○ no data = grey ○ banana = yellow 48
  49. 49. @Xebiconfr #Xebicon18 @scauglog Thank You Do your worst #WTFDataViz 49
  50. 50. @Xebiconfr #Xebicon18 @scauglog Let’s play find the mistakes 50
  51. 51. @Xebiconfr #Xebicon18 @scauglog 51
  52. 52. @Xebiconfr #Xebicon18 @scauglog 52
  53. 53. @Xebiconfr #Xebicon18 @scauglog 53
  54. 54. @Xebiconfr #Xebicon18 @scauglog Let’s fix it 54
  55. 55. @Xebiconfr #Xebicon18 @scauglog 55
  56. 56. @Xebiconfr #Xebicon18 @scauglog Try Again 56
  57. 57. @Xebiconfr #Xebicon18 @scauglog 57
  58. 58. @Xebiconfr #Xebicon18 @scauglog Why ? 58
  59. 59. @Xebiconfr #Xebicon18 @scauglog 59
  60. 60. @Xebiconfr #Xebicon18 @scauglog 60
  61. 61. @Xebiconfr #Xebicon18 @scauglog Let’s fix it 61
  62. 62. @Xebiconfr #Xebicon18 @scauglog 62
  63. 63. @Xebiconfr #Xebicon18 @scauglog Rainbow colormap 63
  64. 64. @Xebiconfr #Xebicon18 @scauglog 64
  65. 65. @Xebiconfr #Xebicon18 @scauglog Simple Shape Simple to understand but hard to draw 65
  66. 66. @Xebiconfr #Xebicon18 @scauglog Simple Shape ● Comparison ● we compare Area or volume ● rectangle > square or circle > 3D ● you can even use non geometrical shape like cat or dog shadow 66
  67. 67. @Xebiconfr #Xebicon18 @scauglog Simple Shape 67
  68. 68. @Xebiconfr #Xebicon18 @scauglog Simple Shape 68
  69. 69. @Xebiconfr #Xebicon18 @scauglog Simple Shape 69

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