Dumbbell dot plots — dot plots with two or more series of data — are an alternative to the clustered bar chart or slope graph. Examples: Young people are less likely to vote: https://twitter.com/pewglobal/status/545589549788045312 Catholics vs. Protestants: https://twitter.com/pewresearch/status/532886903641473028 Pessimistic outlooks by country: http://www.pewresearch.org/fact-tank/2014/11/12/unrest-in-the-middle-east-taking-a-toll-on-peoples-outlooks/
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