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 3

Comparison of predicted and observed distributions of Myriophyllum spicatum and Hydrilla verticillata during model building. 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	91	23	114
	Observed presence	29	54	83
	Total	120	77	197
	Correct prediction	(91 + 54)/197 = 0.74
	Error of commission	23/114 = 0.20
	Error of omission	29/83 = 0.35
	AUC	0.84
	Kappa	0.46

H. verticillata	Observed absence	115	13	128
	Observed presence	37	32	69
	Total	152	45	197
	Correct prediction	(115 + 32)/197 = 0.75
	Error of commission	13/128 = 0.10
	Error of omission	37/69 = 0.54
	AUC	0.79
	Kappa	0.39

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