Relevance Ranking for Vertical Search Engines

List of Tables

Number	Table	Page
2.1	Temporal features for URL freshness and query model.	16
2.2	Evaluation corpus.	19
2.3	Feature weights learned by JRFL.	21
2.4	Performance of individual relevance and freshness estimations.	22
2.5	Query intention analysis by the inferred query weight.	23
2.6	Query length distribution under different query categories.	23
2.7	Comparison of random bucket clicks.	24
2.8	Comparison of normal clicks.	24
2.9	Comparison of editorial annotations.	25
2.10	Case study: Degenerated ranking results by JRFL for query “afghanistan.”	25
2.11	Performance of offline clustering system.	33
2.12	Results with various simple offline clustering algorithms and the real-time clustering algorithm, which includes the metaclustering algorithm.	40
2.13	Real-time ...