The recently released edition of the book, How to Lie with Charts: Investor's Edition, includes the a new Chapter 11: Viewports and Dashboard Displays, which tells how to identify and correct this problem. The price of the new edition has been reduced to $23.99 so it's now the same as the popular second edition, which will eventually be withdrawn from sale. The Kindle price has been reduced to $6.99. Both paperback and ebook versions are available here.
|Scaling the Widget chart in the figure above to be proportional to Acme results in slopes that are comparable.|
In the examples below, without the elongation equalization algorithm, Excel generates by default the chart on the left. The decrease from 100 to -91 and the decrease from 100 to 94 look about the same, but this is a mistaken impression. After incorporating Graphician’s algorithm, the chart on the right correctly shows that the decrease from 100 to -91 is much more than the decrease from 100 to 94.
|Patent No: US8,139,065 B2. Patent owned by: Graphician, a brand owned by Chii Ying Co., Ltd.|
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