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How much PR does my page loose by linking?

Does anybody really know?

     
3:33 pm on Aug 4, 2002 (gmt 0)

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Hi,

I read numerous threads and formulas about how much PR a page can receive from other pages linking to it. I think I've got that.

But what about loosing PR by linking? Suppose I have a page with a PR = 7.0: no links at all on this page, neither to other sites, neither to other pages inside my site.

How much PR will my page be left with if:

1. I link to one other page (external or internal, I suppose the loss is the same).
2. I link to 20 other pages.
3. I link to 100 other pages.

4:04 pm on Aug 4, 2002 (gmt 0)

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pvdm, while it doesn't seem likely that you'd have a PR7 page with no outgoing links, the PR of that page is just the total numerical value of the votes it's been given by the pages linking to it. You won't lose that for the page by linking out, but the amount of value you'll be attributing to the pages you link to from it will depend on how many links you put on it.

You don't lose PR for a page by linking, you just decide how you want to distribute what you'll be giving others.

6:46 pm on Aug 4, 2002 (gmt 0)

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Thanks Marcia, I read in many threads different confusing opinions about that. This is the reason I am asking.

So, let's recap so I am sure I understand this right (this PR7 page is purely theoretical, I don't have one although I would like to ;-):

A PR7 page gets the PR7 rating by the sum of the PR values passed through the links of the pages linking to it. That was clear to me.

But what you tell me is: when a page has a PR7, no amount of links will lessen this PR value, however large the number of links on the page to other sites or pages?

That would mean that each page has a 'reserve' of PR for the same amount as it has for itself. This reserve is used to pass PR to the pages it links to. If there are no links, none of this second 'reserved PR' is passed on. If I put 20 links on this page, each link get around 80% of this reserved PR ( 7x0.8 =5.6 ), but the original PR of the page does not drop at all? That looks too good to be true to me! But then, good things also happen... :-)

That would also mean that each page with PR7 can create 20 5.6 PageRanks by linking to each of these pages? That implicates that each link 'creates' an amount of PR for each link it creates. The total PR of the whole internet must increase at an enormous rate...

8:07 pm on Aug 4, 2002 (gmt 0)

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But what you tell me is: when a page has a PR7, no amount of links will lessen this PR value, however large the number of links on the page to other sites or pages?

Correct, but here's the other side of that which you have to consider: your PR7 page got that value through the strength of its incoming links, and among those contributing linking pages are pages on your own site. So when you link from that page to other pages, links going to other sites will reduce the PR impact to your own pages; the PR that's being passed around internally.

So that's the detrimental effect of having a lot of links, and why some people are paranoid about having outbound links -- it's possible that your PR7 will drop if you add a bunch of links, because you reduce the amount of PageRank that you're keeping within your site.

So, while the PageRank formula doesn't directly lower PR of a page as you add outboung links, there might be that indirect effect.

3:34 pm on Aug 5, 2002 (gmt 0)

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pvdm:
> But what you tell me is: when a page has a PR7, no amount of links will lessen this PR value, however large the number of links on the page to other sites or pages?

Yes, but as JayC points out you can link from that page and back to it, giving you extra PageRank.

People are increasingly paranoid about 'PR leakage', and they should not be.

> If I put 20 links on this page, each link get around 80% of this reserved PR ( 7x0.8 =5.6 )

The PageRank is split among the links, so if you have 20 links they each get 1/20 of that 80%.

This is where people get the wrong idea. If the Toolbar PR chart uses a log scale (it behaves as if it does) then it's logn(n7 x 0.8 / 20) = 5.6 or 5.2 based on a log base n of 10 or 6 (this is much more than 7x0.8/20 = 0.28).

The difference between having 10 links and having 20 links is not 50% PR for each link, more like 5% or 6% on the Toolbar scale for PR7 (an absolute value such as -0.39 or -0.3 depending on the log scale, irrespective of the PR of the linking page).

 

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