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PR trickle down...

how much does it take to lose a PR7 effect....

     
2:30 pm on Oct 2, 2003 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



Have searched on site but couldn't find anything - sorry if this is a repeater.

Need to quiz everyone on trickle-down effect of PR.

From the index page of a PR7 or PR6 site with 400+ good links, what is the optimum number of internal links to ensure the next level down only loses PR1?

Checking a load of sites, many seem to lose 2PR for next level down - especially where they have 60 odd links to internal pages. Have seen almost none where with 40 or 50 links there is a PR1 loss.

I thought internal pages would only lose PR1 (unless you are silly and put 400 links to internal pages).

Plus how does this affect external links i.e. if I want to link from PR7 to PR4 will I automatically get a PR6 provided there only 2 or 3 external links?

5:56 pm on Oct 2, 2003 (gmt 0)

10+ Year Member



PR's exponential base is somewhere between 6-7...

Let's say it's 6.63 (a chip off of Planck's constant... we don't know its a stable base, but why not?).

Small differences in the exponent mean big differences in the number of outbound links before you see a Toolbar measurable difference in the transferred PageRank.

6:01 pm on Oct 2, 2003 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



Hey dpplgngr,

You what? Can I have in plain English - too tired to unravel it ;)

TW

6:48 pm on Oct 2, 2003 (gmt 0)

10+ Year Member



You can't get a simple reply to this because it depends on how the pages within the site are interlinked (as PR is counted for links from both external and internal pages).

In practice, if your first level pages link to the home page and to each other then you'll rarely lose more than 1 PR for those pages.

The problem really only occurs when there's no interlinking of pages so the only PR is that coming from the a single link from the index page.

Mike

7:04 pm on Oct 2, 2003 (gmt 0)

10+ Year Member



You what? Can I have in plain English - too tired to unravel it ;)

How about in plain math?

6.63^5.8 = 58180

6.63^5.1 = 15478

So the PageRank 5 site that really has PageRank 5.8 can grant almost FOUR TIMES as many outbound pages PageRank 4 as the PageRank 5 site that really has PageRank 5.1.

 

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