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Bill Caemmerer’s
Telling the Data Comparison
 Story Using Skyline Graph
      (instead of two pies)


                              IxDA London Redux
                              21 February 2012
                              Virginia Cagwin
                              @vcagwin
Telling What Happened
Just like every picture, every graph tells a story, or it should. Frequently the
 story we want to tell is a comparison to the past or to our plans, a “what
                      happened” story. - Bill Caemmerer
USA                                            UK
       Petrol
                Mobile Phone                Entertainment
                                       Coffee
                                    Mobile Phone
                          Coffee     Petrol
Food


                                                            Travel
                    Entertainment        Food




       Travel




                area= (angle/360)*π r2
Tough Questions
         (for pie charts)


• How much did any item change?
• What do you mean by “percent” 20%
  +5%=21%..??
Comparison Stories:
   “what happened?”
We Want to Know

• Relative changes
  (How many adverts can I air?)
• Biggest most important changes
  (How much money will I lose?)
What makes details easy to see?
Horizons
Silhouettes
• Variation from a horizon line
• Height and width
• Size or area
UK

175%

150%

125%

100%

75%

50%

25%




       USA
UK
     175%

     150%           area = x*y
     125%

     100%

     75%

     50%

     25%
            Food        Travel         Entertainment Coffee   Mobile   Petrol




               32       26                  16         6       14       4
                                 USA
UK
     175%

     150%

     125%

     100%

     75%

     50%

     25%
            Food    Travel         Entertainment Coffee   Mobile   Petrol




               32   26                  16         6       14       4
                             USA
UK
     175%           44

     150%

     125%                                                           5
              33                       17          7
     100%

     75%

     50%                                                    5

     25%
            Food    Travel         Entertainment Coffee   Mobile   Petrol




               32   26                  16         6       14       4
                             USA
Scales well Horizontally
More Info
• Bar-Mekko Charts
• Variable Width Column Charts
• Variwide Charts

• Coming Soon: skylinecharts.net
• bill@caemmerer.net

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Skyline charts by Bill Caemmerer

  • 1. Bill Caemmerer’s Telling the Data Comparison Story Using Skyline Graph (instead of two pies) IxDA London Redux 21 February 2012 Virginia Cagwin @vcagwin
  • 2. Telling What Happened Just like every picture, every graph tells a story, or it should. Frequently the story we want to tell is a comparison to the past or to our plans, a “what happened” story. - Bill Caemmerer
  • 3. USA UK Petrol Mobile Phone Entertainment Coffee Mobile Phone Coffee Petrol Food Travel Entertainment Food Travel area= (angle/360)*π r2
  • 4. Tough Questions (for pie charts) • How much did any item change? • What do you mean by “percent” 20% +5%=21%..??
  • 5. Comparison Stories: “what happened?”
  • 6. We Want to Know • Relative changes (How many adverts can I air?) • Biggest most important changes (How much money will I lose?)
  • 7.
  • 8.
  • 9. What makes details easy to see?
  • 12. • Variation from a horizon line • Height and width • Size or area
  • 14. UK 175% 150% area = x*y 125% 100% 75% 50% 25% Food Travel Entertainment Coffee Mobile Petrol 32 26 16 6 14 4 USA
  • 15. UK 175% 150% 125% 100% 75% 50% 25% Food Travel Entertainment Coffee Mobile Petrol 32 26 16 6 14 4 USA
  • 16. UK 175% 44 150% 125% 5 33 17 7 100% 75% 50% 5 25% Food Travel Entertainment Coffee Mobile Petrol 32 26 16 6 14 4 USA
  • 17.
  • 19. More Info • Bar-Mekko Charts • Variable Width Column Charts • Variwide Charts • Coming Soon: skylinecharts.net • bill@caemmerer.net

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