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| Most common method for actual e-commerce search; includes directories and search engines |
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| Excludes pages requiring authorization, hidden behind search forms, protected by robot exclusion stanard, etc.; as of 2005 there were 11.5 billion indexed pages; dynamic pages not indexed |
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| The element that searches page; can use depth first or breadth first or some combination |
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| The element that indexes; includes forward document index and inverted index |
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| Page id, weighted word list (a bag of the number of words, e.g., "door" appears 10 times, "knob" appears 2) |
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| 2 kinds: query-dependent where there is vector ranking, and global which is query independent e.g., PageRank |
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| Key ranking innovation by Google; links as votes for a page's relevance, weight pages by ranks of pages linking in |
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| Search engine attack where malicious web page shows crawler different content |
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| Services that summarize relative terms on similar items from diferent vendors; focus on price but provide some visibility on other features; e.g., shopping.com |
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| How comparison-shopping engines work |
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| They maintain their databases by crawling vendor sites and updating with "feeds" provided by vendors |
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| Different ways that shopping services earn money |
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| Pay for listings or placement, pay per click, sales commissions, advertising |
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| Used by comparison shopping engines to extract offerings based on client queries; must be developed for each vendor and modified when vendor site changes |
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| A technique for making personzlied recommendations from any type of database to a user based on similarities between the interest profile of that user and those of others, or similarities in attributes of the item |
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| Compares a user to similar users; recommends items liked by similar users; uses cluster analysis to group customers |
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| Starts from the words and points to pages that use the word; useful for retrieval; can be constructed from the forward index |
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| Decision consumer process |
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Definition
1. Awareness-Need recognition
2. Search
3. Evaluation of Alternatives
4. Purchase
5. Post-purchase behavior loyalty |
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Definition
| Take advantage of consistency in HTML format and web page regularities to write a wrapper to extract information repeatedly from a web page (e.g., always know that a certain block contains a field like title, next one contains author, etc.) |
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