Why are external links and their accounting
All the basic parameters of a site having an effect on his ranking, completely under the control of the author of the pages.
In fact, no search engine will not be able to differentiate the quality of the content specially optimized for the needs of search phrases page, even if the text was generated by a conventional robot and has no meaning.
This suggests that the list of the main factors to rank pages is an ordinary examination of external links leading to it. Only this factor can not be controlled by the creator of the site.
One can easily imagine that the interest of site visitors directly proportional to the number of links leading to your site. Search engines decide that if the creators of the other sites have found your resource of sufficient quality and useful in order to expose the external references, then the page rank of the estimated to be higher.
Consequently, a pair of the most important criteria for sorting in the database search engine - relevance (whether related information on a page with a search query - that was described by section above) and the number of quality inbound links. Frequently used names of the last criterion - Citation Index, reference citations or popularity.
Citation index, or how important links
It is noticeable that the usual calculation of the number of links leading to your website is not possible to get enough information to evaluate this site. The usual comparison of the number of links does not say anything about the popularity of the site.
Of great importance is the importance of links: it is obvious that much more significant to get a new link on the main page, www.microsoft.com, than on any website www.hosting.ru/ ~ myhomepage1.html.
For a full evaluation of the quality and quantity of links leading to a site introduced the term citation index (CI).
IC is a general name of the numerical data in which each resource is estimated popularity. It's kind of an absolute measure of how important page. Typically, the counting algorithm IC have each crawler, but he never published.
In addition to the standard IC , characterized by a specific absolute numbers, there is a weighted index of the citation index (VITS), whose value - relative. It is used primarily when working with search engine Yandex and shows the popularity of the selected page in relation to all other existing global network pages.
For more information on citation indices and algorithms you can read in the following sections.
A surprisingly large impact on the ranking of a website in the search text has links leading to the site from external sources.
Link text (anchor, anchor text) is that text that is enclosed by <A> - </ A>. It is for this text users to "click" the mouse on a web page in a browser to make the transition to another page.
A very important "recommendations" for the search engine is the availability of the required anchor text keywords - this is a kind of confirmation of the value and relevance of information search on the site.
Relevant pages with external links
Not only the anchor text shows search engines the information contained on the page where the link leads. The overall content of the page with the link is no less important for the IC.
For example, assume that the goal of our progress - a site with the theme of car sales. Link to a site with resources dedicated car repair will be assessed much higher than if a link leads to project amateur gardeners. Search engines are more "love" similar to each other on the subject of websites, so give them more importance.
Mastering the basics of Google PageRank
The first patent for a system of an external references made by representatives of Google. IC calculation algorithm called PageRank , and its impact on search engine rankings are described in detail later in this chapter.
The calculation of PageRank (citation) is made for each individual page. The main factor to determine the importance of the pages have chosen their attendance (usually theoretical).
Here is an example of a standard transition of the ordinary Internet user is referenced by:
Home Visits sites is thought to occur with the selection of a random page. The user then clicks on the links occurring at other sites. It is likely that the resource can be abandoned at any time by the user for him to start a new "surf" from the start of its path. According to the PageRank algorithm calculated the probability that the magnitude of 0.15 (pitch). Consequently, the probability of 0.85 indicates the continuation of its transitions from one page to another by following the links. In this case, all available on the open page references are equal in their rights. Thus, the user continues its journey endlessly, visiting most popular pages more than the lesser-known.
It turns out that it is the probability that the user is on the page determines its PageRank. The total sum of the probabilities in the algorithm is equated to one, as each user still is one of the billions of pages.
So how to conduct operations with the probabilities are not too comfortable and sometimes downright absurd, the PageRank algorithm several times and eventually converted adjusted to work with real numbers. We can watch them on the familiar toolbar Google ToolBar, where the evaluation of each page of the exhibit on a scale of 0-10.
Watching the above model, we can conclude:
- Initially, all of the pages in the global network are very small, but not zero IC system Google, even in the absence of external links.
- All of the pages on which there are external links, give a small portion of their IC on Google the pages to which these links. The action of the transfer PageRank is inversely proportional to the total number of links - the more of them, the smaller the IC is transmitted every page on the reverse side.
- Transfer IC is not complete, since each step is performed a small loss (this is the same 15-percent chance of viewing a random selection of a new web page).
Now you can see and how PageRank can affect the overall ranking of pages, outstanding as a result of the search. Why "can"? Because that in itself is clean IC is no longer taken into account when calculating the algorithmic into Google. But earlier it was different.
The influence exerted PageRank is very simple: find quite a few relevant pages on text criteria, the search robot sorted them by citation index. Logically, the higher the ranking of the website is shown with plenty of good inbound links, because it, in theory, provides more valuable information than the others.
It turns out that the algorithm IC on Google as it draws up documents, popular and free private searches.
How to use the Google PageRank in practice
Today PageRank is not directly involved in the algorithmic process of Google. Basically, it's all very simple and straightforward to explain - the nature of the indicator only takes into account the quality of the IC and the number of links leading to the site from other sources, but the anchor text and the information contained on a page with a link to the account are not included. However, these two criteria remain top in the rankings. Precise data on the rankings for the Google algorithm is not, since they are kept strictly confidential developers, but by assumption, in the course are only okolotematicheskie Web sites and their PageRank.
To find out the value of PageRank is quite simple, just need to use dashboard Google ToolBar, which shows the value of IC on a scale with a range of 0-10, are defined using logarithms.
Here's a simple example: the exact value of PageRank, is assigned to each page, only he knows Google. To determine the appropriate range of values, and bring it to a toolbar ToolBar, the robot uses a logarithmic scale.
Thus, with a single value for a deuce to raise PageRank is very easy, but to increase the rate of 6 to 7 is really hard.
For practical purposes PageRank only applicable to two problems:
Rating popularity of the site in a hurry
Accurate data about the pages that link to your website to get the PageRank of fail, but you can quickly imagine the degree of development of the resource. Watching the English site, you can share all the resources at the following levels:
- 4-5 PR - good, proven and quite popular website, very typical.
- 6 PR - very high quality promoted resource.
- 7 PR - practically unattainable IC for single webmaster.
- 8-10 PR - itself a rarity, found only in corporations such as Google, Microsoft and others.
On average, knowledge of the value of PR helps in the selection of a resource for link exchange. So you can appreciate the quality of the page offered for exchange, and other similar questions.
Analysis of competition search query
Even though, in a ranking that PageRank algorithm is not involved, it can help to make indirect estimation competitive specific search query. A basic example: if a search engine provides on-demand sites with 6-7 PR, chance to break through in the top of exit site with PR 4 almost none.
It is worth noting that the site's PageRank indicator that is displayed in the toolbar ToolBar very rarely updated. The update occurs about once every 2-4 months, suggesting the possibility of informing the old data. The very search engine usually counts all the changes in the external links significantly faster than the displays this very information in the Google ToolBar.
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