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  • Larry Kummer thinks this is interesting:

This need not be so. There are cases where a similar evolution hides deep changes in the relationship, and in other cases we detect changes but are unaware of how significant they are.

Figure 11.6 shows a rendition of a chart published by Time magazine (international edition, November 4, 2013). The use of two axes and the broken scale on the left mean that the author wanted to highlight a relationship between the evolution of the two variables. As we’ll see in Chapter 14, however, the secondary axis should not be used in these circumstances.


Powerful reformating of a graph from Time, 4 November 2013.