Google‘s Metrix - Ranking Factors

 

Google的Ranking Factor有100多个，其中有很多对Recommendation Engine设计中也很有帮助。

Overall Ranking Algorithm

     

• 24% Trust/Authority of the Host Domain
• 22% Link Popularity of the Specific Page
• 20% Anchor Text of External Links
• 15% On-Page Keyword Usage
• 7% Traffic and Click-Through Data
• 6% Social Graph Metrics
• 5% Registration and Hosting Data

Which of the following statements best represents your opinion of how Google will treat links as part of their ranking algorithm over the next 5 years?
    48%:  Links will decline in importance, but remain powerful, as newer signals rise from usage data, social graph data & other sources to replace them.
    37%: Links will continue to be a major part of Google’s ranking algorithm, but dramatic fluctuations will occur in how links are counted and which links matter.

Top 5 Ranking Factors

1.Keyword Focused Anchor Text from External Links  外部链接的锚文本
73% very high importance

2.External Link Popularity (quantity/quality of external links)   原始链接的流行度
71% very high importance

3.Diversity of Link Sources (links from many unique root domains)  链接域的多样性
67% very high importance

4.Keyword Use Anywhere in the Title Tag   Title标签中关键字的使用
66% very high importance

5.Trustworthiness of the Domain Based on Link Distance from Trusted Domains (e.g. TrustRank, Domain mozTrust, etc.)   域的可信度
66% very high importance

Top 5 Negative Ranking Factors

1. Cloaking with Malicious/Manipulative Intent   恶意伪装
68% very high importance

2. Link Acquisition from Known Link Brokers/Sellers   从链接中介购买链接
56% high importance

3. Links from the Page to Web Spam Sites/Pages    群发的垃圾链接
51% moderate importance

4. Cloaking by User Agent    基于User Agent的伪装
51% moderate importance

5. Frequent Server Downtime & Site Inaccessibility   频繁的宕机
51% moderate importance

Full Ranking Factors:     http://www.seomoz.org/article/search-ranking-factors#ranking-factors
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