Detecting Spatial Clusters via a Mixture of Dirichlet Processes

Table 1

Simulation assessments for three foci-level clusters.

Scenario  ()	Median Num. of Clusters  (SD)	Cluster index	Average Sensitivity  (SD)	Average Specificity  (SD)	Average Accuracy (%)  (SD)
Normal (0.1, 1.0)	IC: 3 (0.88)	1	0.96 (0.13)	1 (0)	0.96 (0.13)
		2	0.96 (0.13)	1 (0)
		3	0.96 (0.13)	1 (0)
	SC: 2 (0.32)	1	0.93 (0.26)	1 (0.04)	0.96 (0.13)
		2	1 (0.04)	0.93 (0.26)
Chi-squared  (0.05, 0.1)	IC: 19 (2.17)	1	0.94 (0.09)	0.91 (0.15)
		2	0.74 (0.43)	0.96 (0.02)	0.54 (0.13)
		3	0.09 (0.03)	0.94 (0.16)
	SC: 2 (0.56)	1	0.76 (0.37)	0.9 (0.1)	0.82 (0.18)
		2	0.88 (0.11)	0.78 (0.36)
Large  1 (0.05, 0.1)	IC: 3 (0.82)	1	0.96 (0.13)	1 (0)	0.96 (0.13)
		2	0.96 (0.13)	1 (0)
		3	0.96 (0.13)	1 (0)
	SC: 2 (0.29)	1	0.92 (0.27)	1 (0)	0.96 (0.14)
		2	1 (0)	0.92 (0.27)
Large  2 (0.01, 0.5)	IC: 3 (0.77)	1	0.99 (0.04)	1 (0)	0.99 (0.02)
		2	0.99 (0.03)	1 (0)
		3	1 (0.01)	1 (0)
	SC: 2 (0.14)	1	1 (0.02)	1 (0.01)	1 (0.01)
		2	1 (0.01)	1 (0)
Large  3 (0.05, 0.05)	IC: 5 (1.25)	1	0.91 (0.13)	1 (0)	0.92 (0.07)
		2	0.88 (0.16)	1 (0)
		3	0.96 (0.09)	1 (0)
	SC: 2 (0.37)	1	0.97 (0.06)	0.98 (0.03)	0.97 (0.04)
		2	0.98 (0.03)	0.98 (0.03)
Large  4 (0.01, 2.0)	IC: 9 (1.3)	1	0.66 (0.14)	0.99 (0.01)	0.62 (0.09)
		2	0.33 (0.08)	0.99 (0.01)
		3	0.8 (0.17)	1 (0)
	SC: 1 (0.36)	1	0.04 (0.17)	0.99 (0.05)	0.51 (0.08)
		2	0.98 (0.07)	0.05 (0.18)

SD: standard deviation across 100 MC replicates; IC: individual foci cluster; SC: study effect clusters.