Analyzing and interpreting spatial and temporal variability of the United States county population distributions using Taylor's law - Fig 4

Abstract

Comparison of the slope of spatial TL (a) and temporal TL (b) across four regions (Midwest, Northeast, South and West) of the US. The overall comparison is tested by the Kruskal-Wallis test and each pairwise comparison is done by the Wilcoxon rank sum test. The number above each pair shows the corresponding p-value. The three horizonal bars in each box plot, from top to bottom, represent the third quartile (Q3), median (Q2), and first quartile (Q1) respectively. The upper and lower whiskers are defined respectively as min(max(slope), Q3+1.5*(Q3-Q1)) and max(min(slope), Q1-1.5*(Q3-Q1)). Outliers (denoted by dots) denote slope values that are greater than Q3+1.5*(Q3-Q1) or smaller than Q1-1.5*(Q3-Q1).</p