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saschaleib t1_izg6tgh wrote

The problem is that while all these issues can indicate a manipulative data presentation, there are also use-cases where each of them does make sense.

For example, if you look at stock prices, it is usually not informative to see them plotted as absolute numbers, as the viewer is normally only interested in the changes - which would be under-represented or even invisible with two almost identical bars.

Same with the double Y-axes: it can be useful to plot two different types of charts on top of each other, and then it is useful to have two axes. For example, you can have absolute values on one chart and percentage change on the other.

And last but not least: sometime only the last three years are indeed interesting.

But in general: very good overview :-)

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