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## Re: Bootstrap PR?

Here is my theory, illustrated by two extreme site constructions; full mesh

and pyramid:

Full mesh: 100 pages, all similar and all crosslinked to each other (i.e. 99

links per page). Result: All pages PR=0. Note that mesh constructions tend

to share the PR evenly amongst all the pages.

Pyramid: 1 home page and 99 other pages. Home page linked to other 99

pages. Other 99 pages each have just 1 link back to home page. Result:

Home page PR=2, all other 99 pages PR=0 Note that pyramid constructions

concentrate PR in the 'top' page.

Virtually all real web sites fall somewhere between these two extremes.

The PR figures above are approximated to integers.

Best regards, Eric.

## Re: Bootstrap PR?

In a fully meshed site without IBL's every page will have a

***real***PageRank of

1.

In the pyramid you describe (and still with no IBL's) the

***real***PageRank of the

index page will increase by (d-d2)/(1-d2) - where 'd' is the damping factor -

for every page you add to the site. If 'd' is 85% it follows that the index page

will increase by 0.459449 per extra page.

If you add IBL's to the index page, its PageRank will increase by X / (1- d^2)

where 'X' is the inbound

***real***PageRank

The open question is how

***real***PageRank converts into Toolbar PageRank - so

let's hope Dave will take up the challenge and create a site with a million

pages. I should gladly have done it - were I not bound for Lübeck tomorrow

morning :-)

--

/Martin Hagstrøm

www.PageRank.dk

## Re: Bootstrap PR?

Eric Johnston wrote:

Your calculations are incorrect as I have fully tested what you wrote

there. All my sites have all the pages linked to each other with even pr

on most of the sites. 3 months ago I changed one site so only the index

page to internal page and internal page back to index page on one site

and there was no change in the pr of the index page only the internal

pages which dropped 1pr so pr5 index had pr4 internals whereas before

all pages were pr5. So the cross linking method only boosts the internal

pages but has no effect on the index page.

Your calculations are incorrect as I have fully tested what you wrote

there. All my sites have all the pages linked to each other with even pr

on most of the sites. 3 months ago I changed one site so only the index

page to internal page and internal page back to index page on one site

and there was no change in the pr of the index page only the internal

pages which dropped 1pr so pr5 index had pr4 internals whereas before

all pages were pr5. So the cross linking method only boosts the internal

pages but has no effect on the index page.

## Re: Bootstrap PR?

How do you know the PR didn't change?

All because the PR reported on the toolbar didn't change, doesn't mean

the real PR didn't change. Look at the difference between one PR point

and the next, it's 6 to 8 fold.

You do understand the concept that PR is calculated on a logarithmic

scale, estimated between base 6 and base 8?

So when comparing pages there is the possibility that 2 PR6 pages are

completely different in terms of PR with one having 6 to 8 times the

PR as the other even though they are both reported as PR6.

This is why we talk about high and low PR6s etc...

I know my index pages on my literature site are high PR6s, probably

very close to PR7 because when there aren't many links from them they

create PR6 pages. This can only occur if the PR6 index pages are high

PR6s.

Whilst one level down in the link structure and the few PR6s at that

level are very low PR6s, but the PR5s on that level are high PR5s,

very close to PR6.

Unless something goes wrong I expect to see PR7 index pages next

update, though the difference between a PR6 and a PR7 is significant.,

so maybe not.

I doubt you'll understand the significance of this Sam, but others

might.

David

--

http://www.search-engine-optimization-services.co.uk /

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