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Hi Tom:
You can't get the exact formula out of Amazon but it is some sort of weighted average representing recent sales of all books in their inventory. So when
Positively Fifth Street went to 2, it meant that only
Harry Potter was outselling it at that point in time. Also, for their best selling books, these ranks are updated every hour. For their poorer selling books, they get updated every month. They have ranks on over 3 million books.
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It should be noted that more than one magazine can have the same Amazon ranking at the same time. There is an article on tthe ranking methodology
here.
TT [img]/images/graemlins/club.gif[/img]