Google Algorithms - Google Site and Link Analysis
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Google Site and Link Analysis refers to the analysis of information about websites, pages, links and patterns. Patented in 2005, Google looks at factors such as the following:
- The length of domain registration
- Domain ownership changes
- WHOIS data and physical address information
- C-Class IP information
- Keyword and non-keyword domains
- The discovery date of new domains/pages
- Document change frequency and the amount of change
- The number of linked internal documents
- Link anchor text
- Link discovery date
- Link changes and deletions
- External link growth patterns
- The authority of external links
- Link quality ratios
- The distribution of links
- The lifespan of links
- Link patterns (new vs old and old vs new)
- Anchor text variety
This is not a complete list. You can get a detailed analysis of this document by GrayWolf at Thread Watch.
It's not clear whether this has been incorporated into Google over the years, but it's a good idea to keep this information in mind when you do link building.
Link spikes can be measured against the search volume in a specific topic. If link spikes are not supported by search volume trends, Google can discount or penalize websites. If the linking pattern exceeds the natural or usual pattern, Google will pay more attention to your website, triggering specialized algorithms to determine whether links are spammy or natural. Remember, Google also owns Google News and can correlate events to link patterns.
Topic Sensitive PageRank TSPR
Topic Sensitive Pagerank (TSPR) bases results on the topical relationship of the query to the documents. This relationship is determined by user input, search history and the Open Directory Project. By matching the topic according to ODP listings, TSPR can return more refined results.
Topic Sensitive Pagerank also takes into account "corrupt" ODP editors who sell listing access. TSPR calculates relevancy based on topical communities rather than pure link power.
Try getting a link from the Open Directory Project. If you're having a hard time, there are editors who sell those listings for a few hundred bucks. Topic Sensitive Pagerank also shows that Google places a lot of emphasis on links from topically related websites. The algorithm itself is very old and has probably undergone changes, or even been replaced by better successors created in-house at Google. Keep in mind the importance of links from related websites.
Topic Sensitive Trust Rank
To understand Topic Sensitive Trust Rank, you need to understand Trustrank.
Trust Rank is an algorithm that requires human input. Humans analyze pages and determine different "seed pages." "Seed pages" are high content, high quality web pages with independent, authoritative, un-affiliated links to other websites. Links from "seed pages" pass Trust Rank to websites. If page X is a seed page linking to pages A, B and C, then Trust Rank is equally distributed between those pages. If A, B and C link to other pages, then Trust Rank continues to flow, but has less power. The further a page is from the "seed," the less Trust Rank is passed.
This algorithm requires humans to identify seed pages.
Topic Sensitive Trust Rank works on the same principle, but relies on seed pages which help determine the topics of websites. DMOZ, Yahoo Directory and other high quality directories can help with this.
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