The pie chart about COVID-19 worries illustrates why we should follow a basic rule of constructing color legends: order the categories in the way you expect readers to encounter them.

Here is the chart that I discussed the other day, with the data removed since they are not of concern in this post. (link)

Junkcharts_abccovidbiggestworries_sufficiency

First look at the pie chart. Like me, you probably looked at the orange or the yellow slice first, then we move clockwise around the pie.

Notice that the legend leads with the red square ("Getting It"), which is likely the last item you'll see on the chart.

This is the same chart with the legend re-ordered:

Redo_junkcharts_abcbiggestcovidworries_legend

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Simple charts can be made better if we follow basic rules of construction. When used frequently, these rules can be made silent. I cover rules for legends as well as many other rules in this Long Read article titled "The Unspoken Conventions of Data Visualization" (link).

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junkcharts
http://junkcharts.typepad.com/junk_charts/

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