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the new edition has been reduced to $23.99 so it's now the same as the popular second edition, which will eventually be withdrawn from sale.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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