I am trying to visualize the relationship between Supplemental Nutrition Assistance Program (SNAP) (“food stamps”) participation and community outreach by state (data here). I started with a scatterplot, which showed a strong positive correlation between the two variables, but the (potential causal) relationship is more complicated than these two variables (and the visual was not particularly interesting). Instead, I settled on a bubble chart: Color shows averages in thousands of dollars and size shows average monthly SNAP participation (in persons). The visual is a screen shot from my first attempt at using Tableau.
June 2, 2014