Originally Posted by deepsand
Originally Posted by mjtaylor
That's true, and there are other factors that may come into play. For example, the link's position on a page may influence PageRank.
While theoretically possible, highly unlikely.
Bear in mind that PR
was intended to emulate the citation system used by academia. A brief viewing of such documents will show a variety of annotation methods and organizational styles. For example, in-line annotations may refer to either a Footnote or a listing in the Bibliography. Footnotes may cite a specific external document, a specific location internal to the document, or to a listing in the Bibliography.
To weight a link based on its location would be to show a preference for a particular style and methodology in a manner that is arbitrary, capricious, and discriminatory.
Additionally, were Google to implement a PR
algorithm other than that published, it would be highly likely that they would also seek to protect against its use by any outside party, by way of filing for Copyright protection.
Now, we are going to quibble. Google has clearly stated
that position of a link may be part of PR
Yes, PageRank is modeled on scholarly citation, and an additional underlying principle is the likelihood of said link being clicked by a random surfer. That is part of the original patent. Google further refined that model in a patent awarded last May
, (applied for in 2004), in which (bold mine):
the font size of anchor text associated with the link, the position of the link within a source document, the position of the link in a list, the font color associated with the link, the attributes of the link, the number of words in the anchor text associated with the link, the actual words in the anchor text associated with the link, the determination of commerciality of the anchor text associated with the link, the type of the link, the context of words before or after the link, the topical cluster with which the anchor text of the link is associated, whether the link leads to a target document on a same host or domain, or whether an address associated with the link embeds another address.
So, indeed, it would seem to be a published, protected principle.