statisticalrethinkin..

15.3. SPACE AND NETWORKS 375correlation0.0 0.2 0.4 0.6 0.8 1.00 1 2 3 4 5kilometers (thousands)FIGURE 15.6. Posterior correlation function. Median correlation by distanceshown by the black curve. e other curves are 200 functions sampledfrom the posterior.b 0.26 0.09 0.08 0.45dev -31.44 2.31 -36.13 -27.63lp__ 913.50 3.55 906.51 920.08A few things can be inferred straight from the table. First, notice that b, the coefficient forlog population, is still positive. Population size increases total tools, even aer accountingfor any spatial effects. Second, there’s a lot of uncertainty as to the autocorrelation function.So we’re going to need to plot it, in order to understand it.Let’s begin by plotting the drop in correlation with distance.post