The PageRank and inlink evidence is incorporated into this query as prior
probabilities. In other words, this evidence is independent of specific queries and
can be calculated at indexing time. The weights in the query were determined by
experiments with TREC Web page collections, which are based on a crawl of the
.gov domain. The relative importance of the evidence could be different for the
full Web or for other collections. The text in the main body of the page was found
to be more important than the other parts of the document and anchor text, and
this is reflected in the weights.