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notkevinjohn t1_izfvunk wrote

I dislike example 2. There are many valid reasons to have multiple axis on a graph, and this might make people think that it's a shady practice. There is also no reason to have the second axis in the example given, since the 'accurate' version ends up scaling them together.

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Andoverian t1_izix7ie wrote

If the units are different (e.g. a percentage and a number, or a number and a currency), a second scale on the same axis is basically a must. Also, I can't recall ever seeing a real graph break this rule and put two scales on the same axis when the units were the same. As such, calling it out in this guide might do more harm than good.

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