ไม่รู้น่ะครับ แต่เว็บผมล่าสุด PR2 ครับ
อยากขึ้น PR ไม่รู้ว่าอิงตารางนี้ได้ไหม
Back Links and Google Page Rank - Computing Degree of Difficulty
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Some of the commonly-asked questions in SEO are: “What is the degree of difficulty of each PR climb? For example, how many links are needed to increase from PR 1 to PR 2, or is it the same amount of links we need to climb from PR 9 to PR 10?”
The answer is the exact base of the logarithm used in Google Page Rank, which can be computed above. Note that we are using a base of 10 in computing for PR. We will attempt to express the above equation as:
X= log b (y)
Where b = the exact base of the logarithm that will translate to the difficulty of each Page Rank. X is the PR and Y is the total inbound links.
Equating for both PR equations:
(log10(y/13.418))/ (1.4717log10e) = log b (y)
And solving for base B:
Base (b) = 10(1.4717loge) (log13.418)
Using a calculator, the exact base is around: 5.26. This also simplifies the calculation of PR given the inbound links:
X= log 5.26 (y)
So every PR climb increases in difficulty by a factor of 5.26. Using this logarithmic base, the following is an example of a simulated back link table:
It shows that starting from one back link for a PR 0 site, you need four links to climb to PR 1. But to climb to PR 2 from PR 1, you now need 22 links. This difficulty further increases for each PR level; it is much easier to climb from PR 3 to 4 (a 620 link difference) than to climb from PR 9 to PR 10 (a 13,130,501 link difference). This is because the PR toolbar is logarithmic. It also explains why there are very few PR 10 sites on the Internet as opposed to lower PR values like PR 1 to PR 3.
How can we use this study to improve the quality of a website's back links?
This study tells us a lot about the Page Rank algorithm. First, since 67% of the Page Rank depends on back links, it makes sense that in every SEO effort, a strong emphasis and plenty of resources will be invested in improving the quantity and quality of back links to the website. Several ethical techniques can improve back links. Techniques such as link baiting and putting up highly useful content to attract natural links are among the best ways to improve the link profile of a website.
It takes more than Page Rank to get traffic and customers from search engines. Make sure that when your link profile improves, and your PR increases, that you also see an improvement in the traffic and conversion rate of your website. This is where non-valuable websites fail and highly useful websites succeed.
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http://www.seochat.com/c/a/Goo...-Links-and-Google-Page-Rank/3/ 
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