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Jeff

The concern I have with your last chart is that the rounded gray bar with the red marker at the end suggests motion from the start of the gray bar to the red marker. On first glance it appears that Brexit Party support is decreasing and labor is increasing rather than differences between two values.

Kaiser

Jeff: No doubt, the "arrow" can be misinterpreted as time movement. Another critique is that there are two possible symmetric versions because either poll can be used as the anchor point. Adding annotation of "prompted" and "unprompted" may help mitigate both these concerns. But I think any graphic that does not convey the shift from X to Y is deficient. Someone else might come up with something better.

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Kaiser Fung. Business analytics and data visualization expert. Author and Speaker.
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