Google RP value of SEO optimization
Source: Shangpin China |
Type: website encyclopedia |
Time: 2012-11-03
Google RP value of SEO optimization
PR is the abbreviation of PageRank. Google PR theory is the most famous of all link based search engine theories. SEO personnel may not know about other link theories introduced in this section, but it is impossible not to know about PR. PR is a concept invented by Larry Page, one of the founders of Google, to express the importance of pages. In the simplest words, the more important the pages with backlinks are, the higher the PR value will be. Google PR is somewhat similar to the concept of mutual reference in scientific and technological literature. The literature that is cited more by other literature may be more important literature. 1. Concept and calculation of PR
We can understand the Internet as a directed graph composed of nodes and links. Pages are nodes. Directed links between pages convey the importance of pages. The PR value transmitted by a link depends on the PR value of the page where the import link is located, the PR value of the page that sends the link itself, and the number of export links on the page that sends the link. PR value calculation formula is: PR (A)=(1-d)+d (PR (t1)/C (t1)++ PR(tn)/C(tn)) A stands for page A. PR (A) represents the PR value of page A. D is the damping index. Generally, d=0.85. T1... tn represents pages t1 to tn linked to page A. C represents the number of export links on the page. C (t1) is the number of export links on page t1. It can be seen from the concept and calculation formula that iterative calculation must be used to calculate the PR value. The PR value of page A depends on the PR value of t1 to tn pages linked to A, and the PR value of t1 to tn pages depends on the PR value of other pages, which may also include page A. Therefore, PR requires multiple iterations. When calculating, set an initial value for all pages. After a certain number of iterations, the PR value of each page will become stable. The research proves that the final PR value after iterative calculation will not be affected no matter how the initial value is selected. 2. Two figurative models of PR
There are two famous metaphors about PR. One analogy is voting. Linking is like democratic voting. A page links to B page, which means that A page votes on B page, making B page more important. At the same time, the PR value of A page itself determines the voting power that A can cast. The higher the PR value of the page, the more important the votes cast. In this sense, the traditional algorithm based on keyword matching is to see what the page itself says the page content is, while the PR based on links is to see how others evaluate a page. The second metaphor is the random surfing metaphor. Suppose a visitor starts from a page and keeps randomly clicking on the link to visit the next page. Sometimes the user feels bored and stops clicking on the link, then randomly jumps to another website and starts clicking down again. The so-called PR value is the probability that a page will be visited in this random surfing visit. The more links a page imports, the higher the probability of being visited, so the higher the PR value. ( Beijing website production ) The damping coefficient is also related to random surfing. (1-d)=0.15 is actually the probability that the user will stop clicking and jump to a new URL randomly when he is bored. 3. Toolbar PR
The real Google PR value used for ranking calculation is unknown to us. All we can see is the Google toolbar PR value. It should be clear that the toolbar PR value is not an accurate reflection of the true PR value. The real PR value is an accurate number that is greater than 0.15 and has no upper limit. The PR value displayed on the toolbar has been simplified to 11 numbers, 0-10, which is an integer, that is, the minimum PR value is approximately 0, and the maximum PR value is approximately 10. In fact, each toolbar PR value represents a large range, and the actual PR value of the page represented by toolbar PR5 may be many times related. The real PR value is constantly being calculated and updated. The toolbar PR is just a snapshot output of the real PR value at a certain point in time. The toolbar PR is updated only once every few months. The toolbar PR has a logarithmic relationship with the number of backlinks, rather than a linear relationship. That is, if there are 100 external links from PR1 to PR2, about 1000 from PR2 to PR3, and more from PR5 to PR6. Therefore, websites with higher PR values need to spend more time and effort to upgrade than websites with lower PR values. ( High end website construction ) 4. Several misunderstandings about PR
The full English name of PR is PageRank. This name comes from the name of the inventor Page. Coincidentally, Page also means "page" in English. So to be precise, the name PageRank should be translated into Page level, not Page level. However, as a rule of thumb, coupled with clever puns, we all call PR page level. PR values relate only to links. The webmaster often asks that his website has been done for a long time, and the content is all original. Why is PR still zero? In fact, PR is not directly related to whether the webmaster is serious, how long it takes to build a website, and whether the content is original. If there is a reverse link, there will be PR, and if there is no reverse link, there will be no PR. A high-quality original website will naturally attract more external links, so it will indirectly increase the PR value, but this is not inevitable. 5. Meaning of pr
Google engineers have said many times that Google PR is now an over publicized concept. In fact, PR is only one of more than 200 factors of Google ranking algorithm, and its importance has declined a lot. SEO personnel need not be too obsessed with the improvement of PR value. Of course, PR is also one of the important factors in Google's ranking algorithm. In addition to directly affecting the ranking, the importance of PR is also reflected in the following points. (1) Collection depth and total pages of the website. The crawling time and database space of search engine spiders are limited. Google hopes to give priority to the pages with high importance, so the higher the PR value of the website, the more pages will be included, and the spiders will try to crawl the inner pages more. For large and medium-sized websites, the home page PR value is one of the important factors that drive website inclusion. (2) Update frequency. The higher the PR value of the website, the more frequently the search engine spiders visit the line. When new pages appear on the website or the content on the old page is updated, it can be included more quickly. Because new pages of websites usually have links on existing pages, high update frequency means fast discovery. (3) Duplicate content determination. When Google finds exactly the same content on different websites, it will select one as original, and the other as reprint or plagiarism. When a user searches for related keywords, the version judged as original will rank first. The PR value is also an important factor when judging which version is original. This is why the large websites with high weight and high PR value often regard the content of small websites as original. (4) Selection of the initial subset of rankings. As mentioned in the previous introduction to the ranking process, it is impossible to calculate the relevance of all files after the search engine selects all the files matching the keywords on the date, because the returned files may be millions or tens of millions. The search engine needs to select an initial subset from them and then do the relevance calculation. The selection of the initial subset is obviously independent of the keyword relevance, and can only be started from the importance of the page. PR value is an importance indicator independent of keywords. The current PR algorithm must have improved and changed compared with the description in Larry Page's profit passing. One possible phenomenon is that the PR algorithm should have excluded some links that Google considers suspicious or invalid, such as paid links, spam links in blogs and forums. So sometimes we will see a page with PR6 or even 7 links, and the page that should be linked with hydrogen will be taken to PR5 or PR4, so it is likely that Google has excluded some links that it thinks are suspicious from PR calculation. The inventor of PR patent is Larry Page, the owner of the patent is Stanford University, and Google has a permanent exclusive right of use. Although PR is a patented algorithm of Google Hot Land, all other mainstream search engines have similar algorithms, but they are not called PR.
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