EURASIP Journal on Information Security

Table 3 Focused crawler effectiveness and efficiency when the first 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
1	Precision	0.687	0.687	0.777	0804	0.913
	Recall	0.624	0.536	0.520	0.480	0.266
	F-measure	0.654	0.602	0.623	0.601	0.413
	Surface Web hits	203	192	176	173	49
	Dark Web hits	126	103	66	61	24
	Total hits	329	295	242	234	73
2	Precision	0.649	0.675	0.769	0.822	0.929
	Recall	0.896	0.764	0.711	0.622	0.365
	F-measure	0.753	0.717	0.739	0.708	0.525
	Surface Web hits	203	192	176	173	49
	Dark Web hits	4198	4198	4198	4198	4198
	Total hits	4401	4390	4374	4371	4147

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