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Message-ID: <4CE21D07.4030009@gmail.com>
Date: Mon, 15 Nov 2010 21:56:23 -0800
From: Lance Norskog <goksron@gmail.com>
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To: java-user@lucene.apache.org
Subject: Re: What is the best Analyzer and Parser for this type of question?
References: <841536.42106.qm@web52906.mail.re2.yahoo.com>
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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:
>    
>> Example of Question:
>> - What is the role of PrnP in mad cow disease?
>>      
> 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
>
>    
>> I am running in 11.638 documents and the result is 10410
>> docs for this question (lowwwwww precision)
>>      
> 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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