What is the best Analyzer and Parser for this type of question?

First question: What's the default operator? Out of
the box, its OR. See QueryParser.setDefaultOperator...

Second, how are you forming your query? Just running
it at the query parser? Query.toString() may be your friend.

Best
Erick

Hi Erick,

My queries going from a list of Genomic TREC 2006...

What the operator you recommend to me?

Thanks,
Celso


2010/11/15 Erick Erickson <erickerickson@gmail.com>

First thing is do not directly query questions. Manually formulate queries:
remove 'what' 'is' 'the' 'of' '?' etc.

For example i would convert this question into:

"mad cow"^5 "cow disease"^3 "mad cow disease"^15 "role PrnP"~5^2 "role mad cow disease"~45 mad^0.1 role^0.5 cow disease PrnP^10
Use OR default operator, collect and evaluate top 1000 documents only.

And instead of Porter you can try KStem.
http://ciir.cs.umass.edu/cgi-bin/downloads/downloads.cgi

Try different length normalization described here. Also their Lucene query example (SpanNear) can inspire you. http://trec.nist.gov/pubs/trec16/papers/ibm-haifa.mq.final.pdf




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First, to understand what your query looks like, go to
admin/analysis.jsp. It lets you see what happens to your queries when
they go in. Then, do the query with debugQuery=true. This will add some
complex junk to the end of the XML page that describes in painful detail
exactly how each document was scored.

After all that- you might have a problem with the PrnP etc. stuff
getting chopped up in weird ways. I don't know how people handle this in
chemistry/bio search.

Lance

Ahmet Arslan wrote:
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