International Journal of Ecology / 2012 / Article / Fig 7

Research Article

Characterizing the Relative Spatial Structure of Point Patterns

Figure 7

Childhood Leukemia epidemiology [6]. Map (a): cases (62 circles) are ill children locations; controls (141 crosses) are a sample of the whole population; distances are in km. Cases are significantly clumped, as shown by both functions (b) and (c), drawn as solid lines. shows that in a 0.7 km radius circle around each case, the case density is 70% higher than expected without aggregation ( ). Confidence intervals for the null hypothesis of independence (dotted lines) are computed by Monte-Carlo simulations at the 10% risk level. The poor significance levels are due to too few controls.

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