EURASIP Journal on Information Security

Table 5 Focused crawler effectiveness and efficiency when the third group of hyperlink selection methods are employed

From: Hybrid focused crawling on the Surface and the Dark Web

Methods		Threshold t
Methods		0.5	0.6	0.7	0.8	0.9
9	Precision	0.700	0.770	0.798	0.780	–
	Recall	0.599	0.561	0.513	0.251	0.000
	F-measure	0.646	0.649	0.624	0.380	–
	Surface Web hits	198	186	172	161	0
	Dark Web hits	102	62	44	0	0
	Total hits	300	248	216	161	0
10	Precision	0.768	0.759	0.728	0.929	–
	Recall	0.589	0.439	0.292	0.066	0.000
	F-measure	0.667	0.556	0.417	0.123	–
	Surface Web hits	190	176	163	48	0
	Dark Web hits	62	0	0	0	0
	Total hits	252	176	163	48	0
11	Precision	0.759	0.745	0.771	0.807	0.903
	Recall	0.599	0.416	0.401	0.371	0.213
	F-measure	0.670	0.534	0.528	0.508	0.345
	Surface Web hits	203	192	176	173	49
	Dark Web hits	62	0	0	0	0
	Total hits	265	192	176	173	49

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