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I'm writing a script that give me the value of a page (say PV) when i want make a link exchange with this page.
The input are the pages'url and it's rank.
After the script fetch the page and try to compute a value for it.
Some factors are:
- the number of external links
- the number of internal links (on other pages of the same site)
- the number of internal links (on the same page with #)
- the number of javascript links (using onClick...)
How can I take in consideration the different values of this variables?
For example is obvious that if this value are bigger than the PV (page value) is smaller.
For sure the weight of external links is bigger than internal links; but in which measure?
And what happen if I find 2 links to the seme destination? and if these have the same anchor text?
IMO external links have a weight of about 75%, internal links 15%, anchor 2% and js links 3%
but it's hard to say something about js links; does google threat them as standard links?
Have you some hint about this?
About the influence of the PR I would use a logaritmic formula.
Infact everyone know that if you have 2 links on a PR8 page the PR this page gives isn't 4, but much more...
My formula would be log ((e^pr)/linkNumber). In this way for example a PR8 with 5 links give a PR of about 6.39. Perhaps in the reality it's more; i can change the log base (using base 10 instead of neperian base I've a more realistic value of 7.3)
Have you some hint about this?
Guru, come here! :)
The worth of a link depends on different factors:
- The number of visitors that you are getting due to the link. (Of course, this depends on numerous factors and is hard to estimate.)
- The benefit due to an improvement of your ranking (for Google as well as other search engines).
The last effect is caused by:
- Anchor text (currently more important)
- Transferred PR (currently less important)
If you want to estimate the PR which is transferred to your site you have to know the real PR of that page as well as the number of links. Google doesn't distinguish between different type of links for the PR calculation. Some links are not considered for PR calculation, but those links which are taken into account have the same weight. Therefore, there is no need to distinguish between internal and external links. Most of JavaScript links are not considered as links. However, Google follows some JavaScript links. These have to be taken into account for the calculation.
The real PR can only be estimated from the toolbar PR. Indeed the toolbar PR is correlated to the real PR on a logarithmic scale. In my opinion the base is even higher than 10. (Although there are many people who would disagree with this.) Also, there are some problems with the toolbar PR, e.g. the displayed valued might not be up-to-date.
I wouldn't worry too much about the exact value. I would exchange links if it's a good site and there would a benefit for the user (and if the site isn't penalized).
thanks!
>If you want to estimate the PR which is transferred
>to your site you have to know the real PR of that
>page as well as the number of links. Google doesn't
>distinguish between different type of links for the
>PR calculation.
Ok, I'm able to know the real PR of the page thanks to some trick ;)
I'm able to know the number of links too. (int and ext)
Why do you say that Google doesn't distinguish between different type of links?
You mean that if my pr7 page has 2 outlinks (1 internal and 1 not) or 2 outlinks both external it transfers the same quantity of pr to the external site?
I don't agree with this :-/
I can agree to not consider js links; but not 100% sure.
Thanks a lot!
Ok, I'm able to know the real PR of the page thanks to some trick ;)
There are some ways to get more informations about the real PR for a page. Either using data from the google directory or using the link structure as well as the toolbar PR of other pages to estimate the real PR. However, even if you will get better values, there is no general way to get the exact real PR of ay arbitrary page.
Why do you say that Google doesn't distinguish between different type of links?
My experience is that Google doesn't distinguish between internal and external links for PR calculation. Other factors such as anchor text might depend on the type of link.
You mean that if my pr7 page has 2 outlinks (1 internal and 1 not) or 2 outlinks both external it transfers the same quantity of pr to the external site?
Yes.
I can agree to not consider js links; but not 100% sure.
I didn't say Google can't follow JS links - it depends on. There are numerous thread about this topic [google.com]
