Tuesday, March 01, 2005

Reports from SES NYC: Day One


Topics include:
"+ The Search Landscape
+ Searcher Behavior
+ Search Algorithm Research & Developments"

re Mike Grehan on algos:
"discusses PageRank and HITS. PageRank he sums up, PageRank is keyword independent. HITS (Teoma) which is keyword dependent. Great way of explaining the difference. He says there is only one problem with these two solutions, "Neither of them work." He said the problem with PageRank, well they don't use it, so he skipped it. He then went on to HITS - topic drift, nepotistic linking and runtime analysis are the three issues. The first two were corrected, but runtime analysis is still an issue."

MG on "difference between a citation and a reference.
Hyperlink analysis algorithms make either one or both of these simple assumptions. Assumption 1 – A hyperlink from page A to page B. Co citations, if a page C cites pages A and B, then A and B are said to be co-cited by C. Pages A and B being co-cited by many other pages is evidence. There are two main algorithms based on links. PageRank (Google): Each page on the web has a measure of prestige that is independent of any information need or query i.e. keyword independent. Roughly speaking, the prestige of a page is proportional to the prestige of the sum of the prestige scores of pages. HITS or Hyperlink-Induced Topic Search. Problem is that neither of these algorithms work."

Future? "personalization. It’s misunderstood, personalization. It’s not giving you a search just for you. Its about returning results for your peer group. They can start to tailor the search specifically to you. There is data now using genetic algorithms and others set that are using these to create search engines. Mike concludes the more information we give the search engines, the better our experience will be."

re Orion's, Dr. E. Garcia on co-occurences:
" Orion explains that co-occurences shows a type of "relatedness" between words. So if you have two terms that are often discussed or found on the same document, they tend to be more related. He then gives an example of the term "aloha". What does aloha make us think of? Hawaii is the correct answer. Orion then explains that this is important when conducting "keyword-brand associations"..."

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