Table 1.

Summary of simulation results

Signal to noise	Evaluation measure	Methods
		SPR with threshold z 1 − 0.025	SPR with threshold z 1 − 0.005	CUSUM with pearson residuals	CUSUM with observations
θ = 5	Mean days to detection	0.5	0.8	1.9	6.1
	Non-detection probability	0.0	0.0	0.013	0.082
	Mean false alarm rate	3.4%	1.0%	5.2%	5.2%
θ = 3	Mean days to detection	1.3	2.7	4.7	11.7
	Non-detection probability	0.0	0.0	0.105	0.158
	Mean false alarm rate	3.6%	1.1%	5.2%	5.2%
θ = 1	Mean days to detection	6.6	12.6	11.9	19.2
	Non-detection probability	0.004	0.120	0.373	0.178
	Mean false alarm rate	3.9%	1.2%	5.1%	5.3%