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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