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From "Ted Dunning (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1908) Similarity javadocs for scoring function to relate more tightly to scoring models in effect
Date Sun, 13 Sep 2009 17:35:57 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754731#action_12754731
] 

Ted Dunning commented on LUCENE-1908:
-------------------------------------


I apologize for complaining here without actually editing this text to illustrate what I would
rather see, but the new text seems to say things like "the scoring function is like this (formula)
except that it isn't because it is really like this (other-formula) but that isn't really
right either because it is like this (still-another-formula) which actually isn't right because
of fields and <mumble>".

There are also many small errors such as claiming that tf is *proportional* to term frequency
and idf is *proportional* to inverse of document frequency.  Proportional means that there
is a linear relationship which is definitely not the case here.  It would be better to say
tf usually increases with increasing term frequency, although occasionally a constant might
be used.  IDF, on the other hand, decreases with increasing document frequency. 


> Similarity javadocs for scoring function to relate more tightly to scoring models in
effect
> -------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1908
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1908
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Doron Cohen
>            Assignee: Doron Cohen
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1908.patch, LUCENE-1908.patch, LUCENE-1908.patch
>
>
> See discussion in the related issue.

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