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Assessment of Value

Assessment of Value. Presented by Ben Hunter and Gretchen Scronce INLS 180: Human Information Interactions October 12, 3004. Images courtesy of http://thesimpsons.com/bios/bios_family_index.htm. Characteristics of Usefulness . Authority Quality Relevance Value. Authority.

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Assessment of Value

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  1. Assessment of Value Presented by Ben Hunter and Gretchen Scronce INLS 180: Human Information Interactions October 12, 3004 Images courtesy of http://thesimpsons.com/bios/bios_family_index.htm

  2. Characteristics of Usefulness • Authority • Quality • Relevance • Value

  3. Authority • According to Amento: “an authoritative document is one that many other documents link to” (297) • Not all links are equally valuable • A good authority is linked to by good hubs and a good hub links to good authorities

  4. Playing the system? • Google bombing • 1. Humor • 2. Ego • 3. Money • 4. Justice • Deterioration of quality

  5. Quality • Subjective • Amento: “The quality of a web site inherently is a matter of human judgement” (296)

  6. Relevance “Relevance refers to the binary state of whether a document is on the same topic as the query or not.” (Glover, E.J., et al)

  7. Value • Based on individual human judgment • Subjective • Determined by user’s information need • Offering search constraints can improve likelihood of value

  8. Does “Authority” Mean Quality? • Brian Amento, Loren Terveen and Will Hill • Published in 2000

  9. Problems faced by Internet users • Finding collections of items relevant to their interests • Identifying high-quality items • Finding items that contain a certain category of information • Creating and maintaining personalized subsets of items

  10. Link-based Algorithms • Do their results correlate with human standards of quality? • Are human standards of quality consistent? Does a shared notion of quality even exist? • Do the different link-based algorithms produce consistent results?

  11. Research Method • 40 subjects from a local university identified sites relevant to specific popular-culture themes • 16 self-identified experts rated the quality of each site • Various link and content-based algorithms used to evaluate sites

  12. Results of the Study • Generally, experts agreed with each other • Search engines were relatively consistent with each other • Experts and link-based algorithms came up with similar results

  13. Surprises for the Researchers • In-degree performed at least as well as more sophisticated methods • Simple page count was almost as good as link-analysis methods

  14. Conclusions • Topic experts make consistent quality judgments • Link-based metrics and a simple content metric both do a good job of identifying high quality items

  15. Problems with Study • Self-selecting, probably homogenous test group (self-identified expert?) • Are broad topics really what people typically search for? • Does pop-culture represent other uses of search engines?

  16. Web Search--Your Way Eric J. Glover, Steve Lawrence, Michael D. Gordon, William P. Birmingham, and C. Lee Giles (2000)

  17. Standard search engine • Searches based on user-generated keyword queries • Ordering policy determines which results are listed first

  18. Metasearch engine • Single interface to multiple search engines • Results are ordered into one list • Metasearches often have difficulty effectively ordering results taken from different search engines--quality is inconsistent

  19. Standard and Metasearch Engines

  20. Inquirus 2 • Source selection based on user preferences: information need categories • Query modification: prepends/appends • Ordering policy: Multi-Attribute Utility Theory

  21. Inquirus 2

  22. Benefits/Drawbacks • User-controlled • May produce results of higher value • Constructing search is more involved for user • Designed for sophisticated searchers--confusing to average Google user?

  23. Conclusion The authors believe that searching features such as those used by Inquirus 2 will enable search engines to produce results of higher value to the user.

  24. Keep in mind… • Not a user study • Inquirus 2 is used by NEC Research Institute, a sophisticated user group • Authors work for NEC • Now at Inquirus 3--searches non-Web based sources

  25. Discussion Questions • Does one characteristic of usefulness seem more important than the others? • Does the popularity of Google, a search engine that uses a link-based metric to assign quality, validate the success of such metrics? Do you think such systems erode over time (e.g. Google bombing) or improve? • How might a typical user react to a complicated search engine like Inquirus 2? • What impact does the continued evolution of the web have on the concepts discussed in these articles?

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