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Another way of observing how Biden was more popular in the more densely populated counties is seen in Fig 6 where we plot the point difference against the population density and see that the Pearson R2 correlation (a measure of the total variation of y explained by the predictor (regressor) x) is ~28%, and the Pearson r (the correlation between x and y) = sqrt(R2) ~ 53%.
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US COVID-19 Cumulative cases from 1/1/2021 thru vs demographics
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