The case against dual axis charts

[Andreas.Motl]

About

Why not to use two axes, and what to use instead.

Tl;dr: We believe that charts with two different y-axes make it hard for most people to intuitively make right statements about two data series. We recommend two alternatives strongly: using two charts instead of one and using indexed charts.

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Why not to use two axes, and what to use instead

– via: The case against dual axis charts (and what to use instead) (2018) | Hacker News