Table 2.

Performance of Textual Multi-Field Retrieval on Title, Caption and MeSHterms

Datasets	Fields	MAP	Bpref	P@5	P@10	P@30	rel_ret
2009	Title	0.1130	0.1551	0.2750	0.3292	0.2750	943
	Caption	0.3348	0.3687	0.6960	0.6120	0.5373	1528
	MeSHterms	0.1015	0.1928	0.1250	0.1792	0.1528	928
2010	Title	0.1176	0.3187	0.1000	0.0875	0.0979	456
	Caption	0.3206	0.6544	0.5500	0.4937	0.3458	742
	MeSHterms	0.1102	0.3232	0.1250	0.1313	0.0917	396