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derek

The bars would presumably be 2004, 2005, and 2006 from left to right, making this effectively a small multiple. Definitely a case where a "panel" or "trellis" line graph format would have been less cluttered with ink.

Also, the shading from light to dark of the three years privileges 2006 in the fight for eyeball time; more ink has been lavished on 2006 compared to the equivalent number in pale 2004.

derek

Perhaps a scatter graph, with assaults on one axis and murders on the other might be worth trying. The direction of time might be represented by symbols for 2004 and 2006, and a dog-legged line connecting them via 2005. The lines would need enough room for clear labels identifying each city, if they all have to share the same graph space.

Jorge Camoes

About the sorting issue: this could be (very loosely...) inspired on Jacques Bertin's reorderable matrix. This is a very useful technique to find clusters of records (in this case cities) with similar, or dissimilar, patterns. I tried this in http://bizviz.jorgecamoes.com/uma-matriz-ordenavel/en/ with EU countries.

Since we have a small number of cases, I would test something like a cross between a line chart for the time series and a scatterplot.

Jeremy Kandah

can we not afford guns in Detroit?

Jorge Camoes

A scatter plot with time series is not always the best option, but in this case it could work, because we have a small number of cases and a general trend. I had to try it, so take a look (I think this is what Derek had in mind, also):
http://bizviz.jorgecamoes.com/exemplo-de-grafico-de-dispersao-com-series-temporais/en/
(sorry about the automatic translation).

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