Analyzing and interpreting spatial and temporal variability of the United States county population distributions using Taylor's law - Fig 3

Abstract

US maps showing the slope (a and b) and the sign of quadratic coefficient (c and d) of the spatial (Q)TL (a and c) and temporal (Q)TL (b and d). Sign of the quadratic coefficient is determined by the coefficient significance after Bonferroni correction. Specifically, "zero" is defined when the p-value of the quadratic coefficient (e of Eq 2) is greater than 0.05/number of tests (55 for spatial (Q)TL and 64 for temporal (Q)TL), meaning that the coefficient is not significantly different from zero. "minus" is defined when the p-value is smaller than 0.05/number of tests and the point estimate of e is less than zero. "plus" is defined when the p-value is smaller than 0.05/number of tests and the point estimate of e is larger than zero. This US map is made with the package fiftystater [43] in R. fiftystater is free software that can be redistributed and/or modified under the terms of the GNU General Public License as published by the Free Software Foundation, version 3.</p