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Wouldn't that be determined by pagerank or no?
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PageRank is one of the major factors. It's not the only factor because, for example, there are algos that address things like high PageRank spam.
The explanation Matt Cutts gave when people complained about pages falling out of the main index last year during the release of Big Daddy is that 1) crawl depth and indexing is dependent on PageRank and 2) the loss of pages in the main index is largely due to devaluation of links that look artificial.