) PR value in Seo is connected with friendship

A good article about PR and friendship in Seo,

Http://www.hanjunxing.com/link-seo

When looking for links to a website, we often place the PR value of the other website in a very important position, but often ignore how many export links the other website has set. In fact, the number of links to a website is as important as the PR value of the website.

Many websites have a high PR value, but there are also many external links, or even hundreds. From the perspective of link exchange, such websites do not have much advantage and are not conducive to Seo. Google tells us that there should be no more than 100 links, because too many links will make readers feel at a loss, it also disperses the weight of PR transmitted by the website itself.

Question: website a: Pr = 3 friendship links = 15 and website B: Pr = 5 friendship links = 100. From the SEO perspective, which is more suitable for your friendship links?

Before answering this question, we need to first determine the impact of the number of website links on the "voting" website. We know that if website B makes a link to website A, it is equivalent to "vote for you ". The higher the PR value of website B, the higher the value of voting. However, if website B has multiple export links, the weight of website B is divided into multiple copies, the less links a website has, the greater the weight it gives to the link. It can be simply understood that the PR value is directly proportional to the value transferred by the website PR, and the number of external links is inversely proportional to the value transferred by the website PR.

From the SEO perspective, the higher the PR value of a website and the smaller the number of exported links, the larger the value of the website's "voting, we need to try our best to make such a website as our import link (that is, external links). This is also the truth for friendship links.

Google's PR value is generated based on this mechanism. Although the formula of the PR value is said to have considered more than 200 factors, we can still use the number of external chains as the basis of the formula:

Pr (A) = (1-D) + d (Pr (T1)/C (T1) +... + Pr (TN) C (TN ))

D: damping factor ). The damping factor is the actual pr score you get when you vote or link to another site. Generally 0.85;

C: number of external links;

T: different external link websites;

If the formula is transformed to evaluate the value of friendship link B of A website a, we can obtain the exact value of this outer link B that passes PR to:

Pr (A) = (1-D) + D * Pr (T1)/C (T1)

= (1-0.85) + 0.85 * (Pr/C)

Here we get the PR that website B passes to website a. Next we need to rate the PR passed through this link: In China, for commercial websites, PR = 7 should be relatively high, but for personal blogs, we reduce the standard set Pr = 5, the number of external links = 20 to the full score, after calculation, the full score is:

Pr (A) = 0.15 + 0.85 * (5/20) = 0.3625

Therefore, we can rate your favorite links based on the PR value and the number of external links:

Y = 100 [0.15 + 0.85*(Pr/C)]/0.3625

That is to say, when the number of external links is 5 and the number of exported links is 20, the score is y = 100. The score y is proportional to the PR value and inversely proportional to the number of external links. Use this formula to answer the following questions:

Y (A) = 100 [0.15 + 0.85*(3/15)]/0.3625 = 88.28

Y (B) = 100 [0.15 + 0.85*(5/100)]/0.3625 = 53.10

Obviously, website a's friendship links will give you more weight. Although the PR value of website B is high, the number of external links is too large, the weight is not as high as that of website B. Measure my blog:

Y = 100 [0.15 + 0.85*(3/7)]/0.3625 = 141.87

No way. My Internet blog currently only has seven links, so the score is high and scary. However, it should be noted that friendship links generally increase over time, while the increase in the PR value often cannot keep up with the increasing speed of friendship links. Therefore, this test is only a real-time value, not a fixed value. Most websites with a high PR value have more stable links, so the risk of score changes is lower.

In fact, when determining whether a website is suitable for making its own links, the number of external links of the other website is only one aspect. We should comprehensively assess whether a website is suitable for exporting links, rather than simply looking at PR and other single factors, such as the speed at which the website is opened directly affects the user experience ...... The idea of "thinking for users" is needed. user satisfaction is the ultimate criterion of SEO.