Google calculates pages PRs once every few months, this is called PR update. After a PR update is done, all pages are assigned a new PR by Google and you will have this PR until a new PR update is done.
New sites that were just launched will have a PR of 0 until an update is done by Google so that they are assigned an appropriate PR.
Other 'possible' factors considered
The following are some other factors might be considered by Google for calculating the PR lately:
* Site age: The older the better, Google seems to like old sites.
* Backlink relevancy: Googles seems to be taking into account how relevant is the page linking to you, if it is not that relevant, the link won't weight much.
* Backlink duration: How long was the backlink up? The more the better.
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