Table 2. Comparison of observed start and end week of norovirus warning phase and predicted start and end week time interval of early detection of norovirus in 6 machine learning algorithms.

Year	Observed start week	Prediction (train)						Observed end week	Prediction (train)
		SVM	MLP	RF	GB	LSTM	GRU		SVM	MLP	RF	GB	LSTM	GRU
2009	42	43	43	43	42~44	41~42	40~42	12	15	16~18	16~18	14	12~13	13~18
2010	40	42	42~43	42~43	42	40~41	39~41	17	18	18~20	18~20	18	16~17	13~18
2011	43	44	44	44	42~44	41~43	39~43	15	17	18~19	18~19	17~19	15~16	14~17
2012	40	42	42	42	42	40~41	39~41	16	17	17~19	17~19	16~17	13~17	13~17
2013	40	43	43	43	42	40~41	40~41	10	13	16~17	16~17	12	10~11	10~15
2014	40	43	43	43	42~43	40~41	39~41	23	21	21	21	24	23~24	18~23
2015	40	43	41~43	41~43	42	39~41	40~41	13	14	17~18	17~18	14~15	13	13~23
2016	40	42	42~43	42~44	42	40~41	40~42	19	16	16	16	16	19	14~23
year	observed start week	prediction (test)						observed end week	prediction (test)
		SVM	MLP	RF	GB	LSTM	GRU		SVM	MLP	RF	GB	LSTM	GRU
2017	43	41	41~42	41~42	41	40~41	40~44	27	24	24	24	24	26~27	15~27
2018	43	43	43	43	42	40~44	40~44	22	19	19	19	21	21~22	13~22