International Journal of Health Geographics

Table 1 Statistical power, sensitivity, and positive predictive value (PPV) of the nonparametric spatial scan statistic and normal-based method for various distributions

From: A nonparametric spatial scan statistic for continuous data

	Power (%)		Sensitivity		PPV
	Nonparametric	Normal	Nonparametric	Normal	Nonparametric	Normal
c = 0.5
Normal	17.3	14.8	0.71	0.65	0.63	0.65
Logistic	17.7	12.9	0.72	0.64	0.64	0.65
DoubleExp	24.0	13.5	0.81	0.67	0.74	0.72
Uniform	13.4	15.4	0.65	0.66	0.62	0.69
Lognormal	19.7	7.6	0.74	0.50	0.64	0.52
t(3)	13.9	7.6	0.66	0.44	0.59	0.55
Cauchy (c = 2)	31.4	5.7	0.83	0.44	0.76	0.38
c = 1.0
Normal	71.8	69.8	0.90	0.87	0.85	0.89
Logistic	76.9	66.7	0.91	0.89	0.88	0.91
DoubleExp	76.9	62.1	0.93	0.89	0.88	0.91
Uniform	62.2	74.8	0.88	0.86	0.85	0.89
Lognormal	83.2	45.0	0.93	0.86	0.87	0.87
t(3)	45.8	25.9	0.86	0.75	0.80	0.80
Cauchy (c = 4)	76.1	16.9	0.92	0.79	0.88	0.74
c = 1.5
Normal	98.6	98.4	0.97	0.96	0.92	0.96
Logistic	98.8	96.8	0.97	0.96	0.93	0.97
DoubleExp	97.6	94.1	0.97	0.96	0.93	0.96
Uniform	98.4	99.1	0.97	0.96	0.93	0.96
Lognormal	99.8	87.9	0.99	0.96	0.93	0.95
t(3)	83.8	58.8	0.92	0.86	0.87	0.89
Cauchy (c = 6)	90.9	30.4	0.94	0.87	0.91	0.85

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ISSN: 1476-072X

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