4.7 Sentence Rank on Yahoo News Page

4.7 Sentence Rank on Yahoo News Page

Due to the excellent performance by sentence rank, a further experiment is conducted: applying sentence rank on real news web pages. In this section, due to the length of report, only implement undirected graph and 10 terms per query, the following success retrieve rate shows a high percentage value when the cosine similarity on 2 web pages is applied by using 4.1 and 4.2 . 10 terms a query means only take first 10 words in the selected sentence including stop words which is consistent with section 4.6. Unlike locating the exact address of a web page itself, this comparison leads to find similar topic document by comparing 2 different URL web pages, the details are all introduced in section 3.4.

  4. 1

 4. 2

Meanwhile, there are 3 search engines employed in this section: Yahoo News Search, Yahoo Web Search and Google Web Search. Unlike from section 4.6 to section 4.1 which only count URL string match as success retrieval, section 4.7 take document similarity into consideration, and if equation 4.2’ s value is bigger than 0.9, which is also permitted in S. T Park and Xiaojun Wang’s research, a success retrieval is considered effective. There are 183 pages in this section which are all from May 4, 2009, Yahoo News, and all related URL addresses are listed in Appendix D.

 

	Success Counts	Success Rate
Yahoo News Search	171	93.44%
Yahoo Web Search	178	97.27%
Google Web Search	177	96.72%

Table4. 29

 

(a)                                                                                        (b)

Figure4. 32

As Figure4.32 ’s (b) shows, the success rate is above 90% which satisfies the project’s initial requirements by applying a single text retrieval method.