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. 2015 Feb 19;92(2):352–378. doi: 10.1007/s11524-015-9937-4

FIG. 6.

FIG. 6

Comparing the spatial intensity of RDS seeds and peer recruits. The first two maps display the spatial intensity of a RDS seeds (N = 46) and b peer recruits (N = 355), respectively. Darker shades indicate greater clustering. c The difference between K functions for RDS seeds and peer recruits (solid black line). When the difference in K functions is positive, RDS seeds are more spatially clustered than RDS peer recruits; when the difference in K functions is negative, RDS peer recruits are more spatially clustered than RDS seeds. The 95 % confidence envelopes for a null difference in the K functions (H0: K seeds(h) = K peer recruits(h)) (dotted red lines) were based on 1,000 Monte Carlo simulations and represent the set of confidence intervals over the range of spatial distances examined. At distances where the difference in K functions exceeds the 95 % confidence envelopes, differential spatial clustering is observed.