Tim, check out p. 155 in LIA where we discuss "Sorting by multiple
fields".
However, what you're really after it seems is boosting documents.
Check out TheServerSide's case study (online or in LIA) - Dion
discusses how he implemented boosting for more recent documents. If
you're indexing documents in ascending date order, perhaps you could
leverage the document id in such a boosting factor?
Erik
On Sep 16, 2005, at 9:43 AM, <[EMAIL PROTECTED]>
<[EMAIL PROTECTED]> wrote:
Hi,
I'm working in an industry which is fairly time sensitive, and older
documents are inherently less valuable. I'd like to be able to
"weight"
the score of search results, so that older documents score lower. I
don't just want to sort by date, though - I'd still like results to be
ordered by score, just an "adjusted" score.
I've read the excellent LIA, including the chapter on custom sort
methods, but from what I can tell that still only implements a sort on
one field - I really want to be able to sort on a "blend" of fields
(one
of this is the actual document score).
Could anyone suggest how I could implement this? I considered
explicitly
weighting the documents with a function of their date at index
time, but
this would mean the "weight" of the new documents would have to
increase
exponentially over time, and I suspect things would get messy! (Our
dataset is around 250k documents, growing by a few thousand a month.)
Cheers,
Tim.
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