The potential habitats of two submerged macrophytes, Myriophyllum spicatum and Hydrilla verticillata in the river ecosystems, South Korea | Knowledge and Management of Aquatic Ecosystems

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Table 4

Comparison of predicted and observed distributions of Myriophyllum spicatum and Hydrilla verticillata at the model confirmation stage. Predicted values were obtained from the fitted probability of presence using the Youden index to apply a threshold probability: 0.536 for M. spicatum and 0.492 for H. verticillata.

Species	Contents	Predicted absence	Predicted presence	Total
M. spicatum	Observed absence	23	6	29
	Observed presence	4	8	12
	Total	27	14	41
	Correct prediction	(23 + 8)/41 = 0.76
	Error of commission	6/29 = 0.21
	Error of omission	4/12 = 0.33
	AUC	0.75
	Kappa	0.44

H. verticillata	Observed absence	28	2	30
	Observed presence	8	3	11
	Total	36	5	41
	Correct prediction	(28 + 3)/41 = 0.76
	Error of commission	2/30 = 0.07
	Error of omission	8/11 = 0.73
	AUC	0.82
	Kappa	0.25

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