SEO Research: Talk about the Web site ranking Link analysis technology

All those who know a little about SEO are aware that links are an important factor in the ranking of websites, but they do not necessarily fully understand which aspects of link analysis affect search engine rankings. Today I'll give you a brief introduction of my observations and thoughts.
First, there are two points to emphasize: 1 The meaning of link analysis technology is more extensive than Google PageRank. Because of Google's aura and the PR of the publicity, so that a lot of people to see the abnormal PR, the PR is the main link analysis, in fact, the search engine links to the analysis of a wide range.
2 link analysis includes import links and export links. I will only talk about the import link, later have time to talk about export links. But it must be clear that the appropriate point to the authoritative site to export links to help the site rankings, and not as many people think, export links will make this page of the PR loss, thus reducing the page rankings.
Search engine analysis of the import link is likely to include the following: Import the number of links to import the importance of the link itself, that is, the link to the importance of your page itself (these two points also formed a Google PR, but the following factors are not directly related to PR.) Reverse Link increase speed reverse link the content of the site itself backlinks the content of the page on which the link is linked reverse link anchor text Reverse link anchor text around the location of the page reverse link in the name of the age of the reverse link is the name of the domain names of backlinks　　The date of the first time it was included. is the page content of the pages in the reverse link changed?　　The first time the reverse link appears on the page when does the link text ever change? What is the change?　　What other sites are linked to the page where the reverse link is located? are the contents of these other sites relevant? What about the quality? Is there a spam link in the reverse link? such as from the Forum signature, blog and other places.
Link clicks how long does it take you to stay on your site after clicking on the link? These are just the things I think about, and there are certainly other search engines that will consider the link factor.