Insufficiency and illusions
More illusions

Gelman remakes a grouped bar chart

Like Gelman, I also cannot stand grouped bar charts. In this recent post, he tries making the chart several ways.

A general lesson learned here is that there really is no one-size-fits-all charts. Multiple line charts often work well as a replacement for grouped bar charts but in this instance, Andrew didn't like the lines being too crowded together. If the lines (i.e. data) look different, then the line chart might suffice. The point is: just make the chart, look at it, and decide if it's good enough.

I left a comment suggesting that in his last chart, it might be more telling if the data are turned into indices so that every line starts from the same level, and then we observe the percent changes over time.

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