Topical Pagerank changes the backlink rule
When the keyword "SEO" was born, most of topics about it was backlinks. But now a day, serach engines evolved so that they can evaluate web contents with other factors.
- What is the Topical Pagerank
- Thesis about Topical Pagerank
- Actual use of Topical Pagerank
The Topical PageRank is extended Pagerank. The PageRank has nothing to do with the theme and topics about the contentns. It calculate only by the links network topology.
But the Toplical PageRank relevants to page theme deeply.
There is a thesis about testing Topical Pagerank. By reading it, we can know the feature about it.
This thesis uses Open Directory's data to classify the topics. And it actually calculate the page ranks for each theme.
The Topical Score is made by this data by scorer, and Query Processor selects the Topical Pagerank to select the query.
This ranking system has following feature.
The previous PageRank is a single value for each page. But in Topical PageRank, each page has value for each topic.
When calculating each Topical Pagerank, the link from pages which do not contain the topic is ignored.
That means the link network is divided into independent small ones, when the topic is niche.
Consequences of that, external inbound links are not important for the niche topic's score.
The main networks are pages linked by internal links. Therefore, internal links are very important to aim at long tail keywords.
Or by linked from specific site written about the topics is very effective. When you do link building, you have to aim at such topic specific sites.
There are many Topical Pagerank for each topic, and when you query with the search engine, which rank to use is dynamically decided.
When your query is suitable for niche topic, external inbound links are not almost used. But the topic is abstract and covering wide concrete inner topics, external links are used.
When you search by google, you can check it by the ranked website's order and external link's number has correlation or not.
This thesis is an example usage of Topical Pagerank. It is almost same with actual use, but I guess there are following difference.
The Authority Rank and Topical Pagerank is independent system, as the google's member say. But he says that The Pagerank do not include authority, but Topical Pagerank evaluates page authority.
That means coefficients for the random surf model and the initial values of the page score, which will be given to other page and taken from other ones on calculation, is up to the page authority score.
If the topics are small, the precision of search by content's authority increases. Then internal links and authority of the page itself become significantly important.
On actual use of Google search with long tail keywords, there is diversity of domains. That means google calculate for small topics.
And I guess the size of topic is similar to one of adword's Keyword Planner.
As the previous pagerank does not evaluate all pages, but Topical Pagerank does not calculate for all page. That is because this calculation needs much cpu power.
I guess, google selects the pages to use before evaluate it, by checking the domain's pages. And a new domain's mission is to join the larger topic's martix.