No, I mean Google's own secret recipe.
If you ever send a question to Google regarding search engine rankings or indexing of web sites, they may send you back an email with the following:
Quote:
As you may know, our automated PageRank algorithm lies at the heart of our technology. PageRank takes into account not only the content on the page in question, but also the quality and anchor text of the links that point
to that page.
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Look at the wording that they use: heart of our technology - algorithm - content - quality.
See - PR is a big deal. Then how come the SERP's for any KW are not ranked according to PR? I think that they are - but it's not a PR that they let the public see.