Hydrologic Time Series Anomaly Detection Based on Flink

Table 5

Comparison of the sensitivity and specificity on the ARIMA model based on sliding window, MARS, and the algorithm in this paper.

Window size	Node number	Proposed algorithm		MARS		ARIMA based on slide window
		Specificity (%)	Sensitivity (%)	Specificity (%)	Sensitivity (%)	Specificity (%)	Sensitivity (%)
10	1 node	82.16	80.98	87.44	82.55	81.57	54.55
	2 nodes	82.63	81.43	87.69	83.12	82.61	57.57
	3 nodes	82.41	80.84	87.57	82.51	81.44	55.82
30	1 node	94.74	90.81	94.99	87.84	93.12	67.28
	2 nodes	94.77	90.67	94.56	87.77	94.34	68.16
	3 nodes	93.98	90.98	94.73	87.98	93.45	68.45
50	1 node	99.46	92.40	97.65	90.41	99.13	72.06
	2 nodes	99.32	92.02	98.04	90.33	99.20	72.51
	3 nodes	99.61	92.98	98.11	90.63	99.29	72.91