I was wondering. Recently the page rank of one of my sites has gone from 0 to 2, in the space of a few days. To the best of my knowledge I have not gained any links to my site in that period of time and I was just wondering does your PR only get updated every so often, or does google calculate it as it goes?

As far as my knowledge goes... PR is updated once in a while..

The PR shown on the Google bar is only updated now and then (roughly every three months) but that is only an estimite of your PR and Google has a constant PR value held in its index.

So how do you see it? I use the site listed in my sig...

Most people will use the Google toolbar to see the PR and there is no way to see the live PR of a web page. In fact no one even knows if it truly does exist, a lot of people just beleive that it does.

The link in your sig is just using the toolbar to queery for a PR value.

So you don't even have any links pointing to your site but I bet you have more than one page on that site, remember that Google also considers your own web pages to be backlinks! So in actual fact you will have links pointing to your site (there just all internal)

Ahh i see so could bump up my PR by hosting a page with loads of links to my page then?

No, each web page passes around 85% of it's PR to a site it links to. If there is more than one link on the page, the PR is distributed between them. If you add loads of links to one of your pages for no other reason than rankings you may be penalised by Google.

A lot of sites add whats known as a root directory to the footer of each page. It is basicly a sitemap but on every page of a site with your keywords as the anchor text. This also helps to evenly distribute PR around your site.

Don't forget that high PR will not mean high rankings and concentrate on your link popularity instead. This will bring rankings and PR.

If I am right google just did a pr update.. I've noticed some of my directory urls go up and some go down.