Table 3.

Estimated α-levels for the Gumbel approximation for different parameters for the space-time scan, corresponding to five nominal α-levels.

						Nominal alpha
Number of cases	Maximum circle size	Maximum cluster length	Region	Probability Model	Number of Monte Carlo replicates	0.00001	0.0001	0.001	0.01	0.05
600	50%	7 days	NE counties	Space-time Permutation	99	0.000003	0.00004	0.0006	0.008	0.051
					999	0.000006	0.00007	0.0009	0.010	0.053
					9999	0.000003	0.00005	0.0007	0.009	0.051
600	50%	7 days	NE counties	Space-time Poisson	99	0.000002	0.00005	0.0007	0.010	0.051
					999	0.000006	0.00007	0.0008	0.010	0.051
					9999	0.000003	0.00004	0.0006	0.008	0.049