Jun 21, 2002, 1:53 PM
Post #6 of 8
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I don't know the actual algorithm, but when you type in the search
title:hello^3 AND heading:dolly^4
Will product different document scores than
title:hello AND heading:dolly^4
Lucene will get the score for a given document, not a field. So it does
combine the results of the two fields together. Again, I don't know how it
combines them.
I just tried it on my project and depending on what the boost factor is per
field, it changes the overall score.
I hope this helps
--Peter
On 6/21/02 1:33 PM, "Mike Tinnes" <tinnes@ecliptictech.com> wrote:
>
> But is there a way to combine the scores of the individual fields to create
> one total score? The problem is that the highest ranking document for the
> 'title' query will not necessarily match the highest ranking document for
> the 'heading' query. I suppose I could simply add them up, but that would
> mean iterating through all the results of both queries and adding the scores
> to find the highest combined total. I don't suppose Lucene has a method of
> ANDing in this manner to create a combined total field score?
>
> - Mike
>
> ----- Original Message -----
> From: "Peter Carlson" <carlson@bookandhammer.com>
> To: "Lucene Users List" <lucene-user@jakarta.apache.org>
> Sent: Friday, June 21, 2002 2:35 PM
> Subject: Re: Weighted index
>
>
>> Or you could convert the query to
>>
>> title:"use search string"^5
>> Or
>> heading:"user search string"^3
>>
>> The ^ symbol will add the boosting factor to the score.
>>
>> You could also do this once you create the Query from the QueryParser, but
>> this is up to you. Before or after the QueryParser, but I would probably
>> have Lucene do the scoring.
>>
>> --Peter
>>
>> On 6/21/02 12:15 PM, "Mike Tinnes" <tinnes@ecliptictech.com> wrote:
>>
>>>
>>> I suppose I could take the users search string and use it to query on
>>> multiple fields using the query syntax. Then weight the resulting scores
> for
>>> the individual fields as I wish. Something like this..?
>>>
>>> score_1 = results of searching with 'title:"user search string"'
>>> score_2 = results of searching with 'heading: "user search string"'
>>> ...
>>> score = ((score_1 * 5) + (score_2 * 10)) / 15
>>>
>>> - Mike
>>>
>>>
>>> ----- Original Message -----
>>> From: "Peter Carlson" <carlson@bookandhammer.com>
>>> To: "Lucene Users List" <lucene-user@jakarta.apache.org>
>>> Sent: Friday, June 21, 2002 1:48 PM
>>> Subject: Re: Weighted index
>>>
>>>
>>>> Lucene supporting boosting of terms in a query which will increase it
>>>> relative weighting in the search results, but this is not supported on
> a
>>>> index level.
>>>>
>>>> So you could get the users query and add a boost factor to those fields
>>> you
>>>> want to have higher relevancy. There has been some discussion on how to
> do
>>>> this at the indexing level, but nothing has started yet.
>>>>
>>>> --Peter
>>>>
>>>>
>>>> On 6/21/02 11:39 AM, "Mike Tinnes" <tinnes@ecliptictech.com> wrote:
>>>>
>>>>>
>>>>> Hey all, is there any method that allows for the weighting of indexed
>>> fields?
>>>>> I'd like to implement a web search in which keywords occuring in
> certain
>>>>> elements (title, heading, metatags) score higher than others (body,
>>> links,
>>>>> etc).
>>>>>
>>>>> Thanks, Mike
>>>>>
>>>>>
>>>>
>>>>
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