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From "Yatin Soni" <yatins...@interinfosystems.com>
Subject Lucene Search result (scoring )
Date Thu, 14 Jun 2007 16:53:35 GMT
Hi,

    We are using Lucene as search engine and I have a question regarding the scoring of search
results, I had given a example for it,

Example :-->

suppose we have four Items on which we have indexed,
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
1)demo --> contents: Jumbo Numbers
2)demo2 --> contents: Jumbo Numbers
3)demo3 --> contents: Jumbo Numbers
4)demo4 --> contents: Jumbo Numbers

Search Results for query ->"Jumbo"

demo:  Score: 0.3884282
demo2: Score: 0.3884282
demo3: Score: 0.3884282
demo4: Score: 0.3884282
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Test 1 >>  Change the contents of items

1)demo --> contents: Jumbo Numbers Stamps Numbers
2)demo2 --> contents: Jumbo Numbers Stamps Jumbo
3)demo3 --> contents: Jumbo Numbers Numbers Test
4)demo4 --> contents: Jumbo Numbers Stamps Jumbo

Search Results for query ->"Jumbo"

demo2: Score: 0.54932046
demo4: Score: 0.54932046
demo:  Score: 0.3884282
demo3: Score: 0.3884282

# In the Test 1 items(demo2 and demo4) both contains 2 occurrence of "Jumbo" and rest items(demo
and demo3) 
  have only one occurrence of "Jumbo" so result are coming as per the high score.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Test 2 >>  Change the contents of items

1)demo --> contents: Jumbo Numbers Stamps Numbers
2)demo2 --> contents: Jumbo Numbers Stamps Jumbo Parquetry Block Super Set
3)demo3 --> contents: Jumbo Numbers Numbers Test
4)demo4 --> contents: Jumbo Numbers Stamps Jumbo

Search Results for query ->"Jumbo"

demo4: Score: 0.5493204
demo:  Score: 0.3884282
demo3: Score: 0.3884282
demo2: Score: 0.3433253

# Now in the Test 2 We are changing the contents of demo2, and by searching the same query
"Jumbo" the results
  are different from the Test 1.And the score for demo2 is also less as compare to the items
(demo and demo3) 
  which have less occurrence of "Jumbo" as compare to demo2.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////

According to the example search results are coming in the following sequence:---->
1. demo4: Score: 0.5493204
2. demo:  Score: 0.3884282
3. demo3: Score: 0.3884282
4. demo2: Score: 0.3433253

but we are expecting in the following sequence :--->
1. demo4
2. demo2
3. demo
4. demo3

OR

1. demo2
2. demo4
3. demo
4. demo3

because demo2 contains the two occurrence of "Jumbo" which is higher than the items demo and
demo3. I have sorted the results with their RELEVANCE but then also
results were coming in the same sequence.

So my QUESTION is that can we make desire sequence as per the occurrence of a particular word?
Can we make demo2 above the demo and demo3 in the search results?

So I need help on this issue....

Thanks,
Yatin



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