Fig. 1: Assessment of spatially explicit statistical models. | Humanities and Social Sciences Communications

Fig. 1: Assessment of spatially explicit statistical models.

From: Duration of agriculture and distance from the steppe predict the evolution of large-scale human societies in Afro-Eurasia

Fig. 1

Distribution of imperial density (upper left) compared to distribution predicted by the spatial GLS model (upper right)(values are divided into into quantiles). Comparison of observed imperial density and predicted values from GLS model (bottom left). The residuals (lower right) from this relationship indicate where the model predicts the real data reasonably well (light green), or where it over-(orange, red) or under-(light blue, blue) estimates the observed imperial density (category cut points are based on standard deviations—1 s.d. = 5.7). The GLS estimates are based on the model ranked 2 in Table 2 as it contains all the tested parameters.

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