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# Pagerank and hits

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An essay on Pagerank and HITS searching algorithms..

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### Pagerank and hits

1. 1. Hyperlink based search algorithms-PageRank and HITS Shatakirti MT2011096
2. 2. Dimensionality ReductionContents1 Link Analysis and Web Search 22 Hyperlink-Induced Topic Search (HITS) 2 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.2 Motivation behind developing the HITS algorithm . . . . . . . 2 2.3 Authorities and Hubs . . . . . . . . . . . . . . . . . . . . . . . 3 2.4 HITS Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.5 HITS Implementation . . . . . . . . . . . . . . . . . . . . . . 5 2.6 Advantages and Disadvantages of HITS . . . . . . . . . . . . . 63 PageRank 6 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 PageRank algorithm . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 PageRank Implementation . . . . . . . . . . . . . . . . . . . . 7 3.4 Problems with the algorithm and their modiﬁcations . . . . . 9 3.4.1 Rank Sink . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.4.2 Dangling Links . . . . . . . . . . . . . . . . . . . . . . 10 3.5 Advantages and Disadvantages of PageRank . . . . . . . . . . 11References 12List of Figures 1 Hubs and Authorities . . . . . . . . . . . . . . . . . . . . . . . 4 2 Page Rank Example . . . . . . . . . . . . . . . . . . . . . . . 8 3 Rank Sink/Page Cycles . . . . . . . . . . . . . . . . . . . . . . 9 4 Rank Sink/Page Cycles . . . . . . . . . . . . . . . . . . . . . . 10 5 Link-Farms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1