EURASIP Journal on Information Security

Table 4 Focused crawler effectiveness and efficiency when the second 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
3	Precision	0.742	0.741	0.777	0.805	0.914
	Recall	0.619	0.538	0.523	0.482	0.269
	F-measure	0.675	0.624	0.625	0.603	0.416
	Surface Web hits	203	192	176	173	49
	Dark Web hits	132	122	111	106	69
	Total hits	335	314	287	279	118
4	Precision	0.768	0.770	0.766	0.779	0.874
	Recall	0.596	0.579	0.563	0.510	0.282
	F-measure	0.671	0.661	0.649	0.617	0.426
	Surface Web hits	498	496	496	464	227
	Dark Web hits	138	136	136	131	94
	Total hits	636	632	632	595	321
5	Precision	0.743	0.740	0.777	0.804	0.913
	Recall	0.617	0.536	0.520	0.480	0.266
	F-measure	0.674	0.622	0.623	0.601	0.413
	Surface Web hits	203	192	176	173	49
	Dark Web hits	86	77	66	61	24
	Total hits	289	269	242	234	73
6	Precision	0.698	0.740	0.777	0.804	0.913
	Recall	0.617	0.837	0.520	0.480	0.266
	F-measure	0.655	0.786	0.623	0.601	0.413
	Surface Web hits	203	192	176	173	49
	Dark Web hits	111	77	66	61	24
	Total hits	314	269	242	234	73
7	Precision	0.687	0.687	0.777	0.804	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	513	486	470	451	231
	Dark Web hits	127	67	62	62	25
	Total hits	640	537	513	513	256
8	Precision	0.674	0.672	0.765	0.791	0.913
	Recall	0.624	0.536	0.520	0.480	0.266
	F-measure	0.648	0.596	0.619	0.597	0.413
	Surface Web hits	211	200	176	173	49
	Dark Web hits	126	103	66	61	24
	Total hits	337	303	242	234	73

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