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Overstacking Bars

Mint goes too far with a stacked column chart

Mint-IncomeDistributionStackBar

This stacked column chart is certainly pretty, but falls down on usability. It does not make it easy to compare income levels across states. Reading across the bottom it works for the lowest income group and reading across the top it works for the highest. For the five groups in between it does not work at all because there is no common point of reference. It is very difficult to compare an inner bar to any other inner bar.

This infographic would be less pretty, but far more useful if each group was displayed in its own row with a common zero line. Then the eye could easily scan across to spot the highs and lows.

The lesson is that a stacked column or bar chart can be useful at times, but only when a small number of comparisons are made or when the differences among the bars is very evident. Otherwise, don’t do it!