Page rank lets the link "vote"

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July PageRank is about to update, although the PR value of the current Google algorithm accounted for a smaller proportion, but when the PR value update, to see their own site PR rose, for stationmaster, still have that kind of satisfaction, sense of pride.

The following may be compared to the old point, it is a new warm, elegant demeanor Yyan will also put some of their own experience and ideas into the inside.

PageRank, page rank, also known as the page level, Google left the ranking or page ranking. Pagerank™ is named after Larry Page, the company's creator. is a Web page ranking by search engines based on hyperlinks between pages. It is often related to search engine optimization. The PageRank system is used by Google to reflect the relevance and importance of Web pages. Google's founder Larry Page and Sergey invented the technology at Stanford University in 1998.

Let's start by looking at how Google's official Web site introduces its own technology:

PageRank technology: By calculating the equations consisting of more than 500 million variables and 2 billion words, PageRank can objectively evaluate the importance of Web pages. PageRank does not calculate the number of direct links, but instead interprets the link from page A to page B as a vote on page B by page A. In this way, PageRank evaluates the page's importance based on the number of votes received by page B.

In addition, PageRank will evaluate the importance of each polling page, because some Web pages are considered to be of high value, so that the pages they link to can be of high value. Important pages get a higher PageRank (page rank), which is displayed at the top of the search results. Google Technology uses the comprehensive information of online feedback to determine the importance of a Web page. The search results have not been manually interfered or manipulated, which is why Google becomes a fairly unbiased source of information that is widely trusted by users and is not affected by a pay ranking.

In early 2005, Google launched a new attribute nofollow for Web links, so webmasters and Seoer could make links to Google that would not be counted as votes. Nofollow settings can resist commenting on rubbish.

Elegant demeanor Yyan collected on the Internet some PageRank algorithm, sorted out, PageRank roughly can be divided into two kinds:

First, the simple algorithm:
For example, a small group of 4 pages: A,b, C, and D. If all pages are linked to a, then the PR (PageRank) value of a will be b,c and D.

PR (A) = PR (B) + PR (C) + PR (D)

Continue to assume that B also has links to C, and D also has links to 3 pages including a. One page cannot vote 2 times. So b half-price each page. With the same logic, only one-third of the votes in D were counted on the PageRank of a.

Elegant demeanor Yyan feel, according to the total number of links to the PR value of a page.

Finally, all of these are converted to a percentage multiplied by the last coefficient Q. Because of the algorithm below, no page PageRank will be 0. So, Google gives each page a minimum value 1−q through the math system.

So the PageRank of a page is calculated by the PageRank of other pages. Google repeatedly calculates the PageRank of each page. If you give each page a random PageRank value (not 0), the PR value of these pages tends to be normal and stable after repeated computations. That's why search engines use it.

Second, the complete algorithm:

This equation introduces the concept of random browsing, that is, someone online boring randomly open some pages, click some links. The PageRank value of a page also affects the probability that it will be browsed randomly. In order to facilitate understanding, this assumes that the Internet users constantly point to the link on the page, eventually to a page without any links to the page, when the Internet users will randomly to another page to start browsing.

In order to be fair to those pages that have a link, q = 0.15 (the meaning of q = See above) is used on all pages, estimating the probability that the page may be bookmarked by the Internet users.

So, this equation is as follows:

P1,P2,..., PN is the page to be studied, M (PI) is the number of links to the Pi page, L (PJ) is the number of PJ links out of the page, and N is the number of all pages

The PageRank value is a eigenvector of a particular matrix. This eigenvector is

R is the answer to the equation.

If PJ doesn't link to pi, and it's true for every j, it's equal to 0.

The main disadvantage of this technology is that the old page level is higher than the new page, because the new page, even a very good page, there will not be many links, unless he is a site of the subweb.

This is why PageRank requires a combination of multiple algorithms. Before the stone also said Wikipedia.com in Google some of the key words in the overall performance of more than a number of portal sites, on the other hand, is also the joint efforts of tens of thousands of of netizens.

One of Google's Yyan to Wikipedia is that PageRank seems to prefer the Wikipedia page, which is always preceded by most or all other pages in the search results of the entry name. The main reason is that Wikipedia has a lot of links to each other, and there are many sites linked.

Google often punishes malicious actions to improve PageRank. How Google distinguishes between normal link swapping and abnormal link stacking is still a commercial secret.

Believe that after reading the above content to pagerank more in-depth understanding.

One of the ways that search engines can evaluate the quality of Web pages is PageRank, which is often used as a scoring factor for Google's search engine page.

You can find PageRank scores on any page by using your browser to browse through the web and download the Google toolbar. Putting your mouse on the Green PageRank Bar will immediately show a number from 0 to 10, which is the PageRank value, the distribution of Google's importance to the page. The toolbar displays the PageRank of the page according to the PageRank scale, but in the current PageRank algorithm is not only 0 to 10 of the data, in Google's server, the PageRank allocation number is likely to be 0 accurate to 100, Even a value of 1000.

PageRank is updated on average every three months, not on a regular linear scale, but on an exponential scale. This is a very complicated mathematical term (previously mentioned), meaning that PAGERANK4 is not better than PAGERANK3-it is 6 to 7 times times better. So the gap between a PageRank5 Web page and a PageRank8 page is much larger than you might think.

PageRank value in these days to update, we talk about the current PR algorithm! When a Web page links to your page, the search engine is how to transfer the authority of the page to your site (that is, PageRank transfer). So you want to have the highest PageRank score on the Web page to get links, to constantly search for high PR site, is not it?

It worked in the past, but now it's a lot more complicated than that, an authoritative transfer has to do with the number of links that exist on the page-the fewer links, the higher the authority that each link shifts, Usually the only link on the PageRank5 page is worth more than one of the 100 links on the PageRank7. Of course, this is also a prerequisite, that is, stand in the link between the content of the contents of a higher degree.

such as: A (SEO data station) station at the same time chain to B (SEO Service site), C (Corporate apparel website)
Then a station PageRank transferred to B, C that station received the high points, in many experiments proved B station to get a station PR transfer score higher than C station, the reason is very simple: A, b Two station similarity is very high, the score is naturally high.

We all know the importance of PR value before, but really mention, do not fall into the trap of PageRank temptation. For your Web page, the most important thing is to be linked to those who can bring traffic to your site, rather than see PageRank chain. Use PageRank as a tool to validate your own judgment of the quality of a potential link source, rather than blindly follow PageRank when doing your list of linked sources.

PR value in these days update, wish seoer good luck!