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Originally Posted by simonm
Page ranking is (appears to be) also determined by the type of web site, business or private and many other factors, not just the quantity and quality of backward links.
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Only indirectly, Simon. The type of website you have will determine which categories of directories you get listed in (not all DMOZ or Yahoo categories have the same PageRank value for instance, and some have a lot more outbound links to divide their PageRank among than others too). It will also determine the other types of sites that are likely to link to you, and how willingly.
PageRank is a mathematical algorithm that calculates the relative number of citations, both direct and indirect, that any
page on the web has. It includes internal links (pages from your own site) because
PR works on a page by page basis, not a site basis.