2016 State Per Capita GDP vs Democratic Lean

How well do states perform economically that have populations leaning Democrat or Republican? To try to answer this question, I took data from Gallup for 2016* to determine political leaning and compared it to data from the US Bureau of Economic Analysis for state per capita GPD* using a Pearson correlation calculation.*


State Per Capita GDP vs Percent of States Identifying as Democrat or Lean Democrat

From the resulting graph, one might expect a slight positive correlation, and one would be right. The value of R is 0.462. Although technically a positive correlation, the relationship between the variables is weak. The value of R2, the coefficient of determination, is 0.2134.

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For the sake of thoroughness, we can perform the same test for percentage of states that lean Republican:


State Per Capita GDP vs Percent of States Identifying as Rep or Lean Rep

From the resulting graph, one might expect a slight negative correlation, and this is what we find. The value of R is -0.4692. Although technically a negative correlation, the relationship between the variables is weak. The value of R2, the coefficient of determination, is 0.2201.

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What, if anything does this prove? Primarily, it doesn’t appear that either Republicans or Democrats can strongly boast of improving the economy if that metric is based on per capita income. However, if one side did want to make the claim to being better for the economy, the analysis appears to support the Democrats. These results are similar to those I found in another Pearson correlation I performed using Gallup data in comparison to unemployment figures.

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