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Can't we just all contribute 5 or 10 bucks to Googleguy and buy the algo? That would make everyone here a lot happier wouldn't it, plus we'd all be playing by the rules so google would be fine too!
- # of links on the page you are being linked from (more links splits the page's vote)
- PR of the webpage with the link
- plus a dampening affect - so even if you are the only link on a webpage with PR 4 this will not give your webpage a PR4 due to this dampening... (some have said this is somewhere between 5-7)
I'm still whining about my drop from PR4 to PR3 after the last update. The site is not very old but I achieved a PR4 almost immediately so when I dropped to PR3 it was quite a shock. I added a bunch of content and backlinks before this last crawl so I'm biting my fingernails waiting for the new dance. (hurry hurry!)
Samething happened to me, my PR4 (now high PR3) site was actually one page (and subdomain), but I think there will be a few more inbound links this update, plusif i'm lucky it goole will have indexed the entire 600+ pages I added since the last update, i've also got my root which is a medium PR3 which i have got substancial new inbound links for google to see... And a lot more ligned up fro the next update too... Oh and around 60 new pages for it to index :D
The dampening factor is something like when you see meat in the butcher counter at the market. You can see a steak that's 1 pound, but it'll have a figure for "tare" which is an allowance for the weight of the packaging.
That "tare" (like the dampening factor) is figured into calculating the gross weight of the package and the net weight of the meat inside it.
Total actual weight of it all - minus the "tare," the allowance reflecting the weight of the packaging materials - equals the actual real weight of the meat inside the package you're buying.
Forget the steak, figure it's pork roast instead, sliced into portions. So much weight for the whole roast before cooking, and again, the weight loss from shrinkage during cooking is equivalent to the "tare" just like the damping factor works. It reflects a percentage of reduction in weight, so that the final "cooked" net weight is less than the weight was before cooking.
Divide by the number of portions it's sliced into, and calculating that weight loss during cooking time into the final figure, the weight of the portions it's divided into after the deduction for loss represents a bit less weight each portion would have been prior to cooking.
If it's cut into four portions each one will have more weight than if it were cut into eight portions. Total weight before cooking - less loss from shrinkage during cooking = final net weight, divided by number of portions - equals the final net weight of each portion at serving time.
Same thing as with web page, PR, damping factor and dividing up by number of outbound links on the page.
<added humor> I am a level 4 Vegan.....I don't eat anything that casts a shadow </added humor>
If you're serious, you should go to PR4+ the first time your site is indexed.
A dozen reasonable links would take you straight to PR5.
If your site is half decent, it should be no trouble to get a few links.
I had a low PR6 with my very sparse site, 6 weeks after it was launched.
Your site may have been a low PR7 before and has just dropped back to a high PR6. I seem to remember that googleguy said something after the last update about PR dropping across the board ("only a cerain amount of PR to go around" - or something similar). I could be mis-remembering, tho'.
In any case, I agree with Pyewacket, you've got some really good content.
A great explanation of the PR algo and a link to the original paper is here:
The dampening factor corresponds to the "PR source" or random jump factor. In the "random surfer" model, this corresponds to the number of times a hypothetical random surfer will not click on the link to your site, but will instead jump to a random page. This is made up for by the fact that your page itself is a PR source, as provided by the same factor.
The number of links you need for a given PR depends on the number of links on each page, as discussed above. Your easiest way to get PR4 is just get one link from a PR5 page with a reasonable number of links, that by itself should do it. If all you can get is PR4 links, try to get them on pages with few other links. Good luck.
The loss in PR was more than just the dampening effect tho. I lost about 100 backlinks that show wiht the Google bar and who knows how many more that were too low PR to show. When I do the search on alltheweb I find that Google is only showing about 1/5 of my external backlinks. I think this had something to do with a new algo that discounted some of the really ancient incoming links.