Fig. 7
From: Evaluating neighborhood structures for modeling intercity diffusion of large-scale dengue epidemics
Study framework of statistical analysis: Different colors represent different-order neighborhood structures. The variables in the first layer (blue) represent a township i; the second layer (green) represent the 1-order neighborhood (immediate neighbors), and the third layer (pink) represent the 2-order neighborhood (distant neighbors). The arrows represents influence relations between these variables