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https://issues.apache.org/jira/browse/MAHOUT-941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lance Norskog updated MAHOUT-941:
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Summary: Improve ConfusionMatrix statistics (was: Strip quoted text from
emails and add statistics to ConfusionMatrix)
Rename this to focus on Confusion Matrix stats.
Stripper for quoted lines is added to [MAHOUT-939], removed from this patch.
> Improve ConfusionMatrix statistics
> ----------------------------------
>
> Key: MAHOUT-941
> URL: https://issues.apache.org/jira/browse/MAHOUT-941
> Project: Mahout
> Issue Type: Improvement
> Components: Classification
> Reporter: Lance Norskog
> Assignee: Grant Ingersoll
> Priority: Minor
> Fix For: 0.6
>
> Attachments: Bayes.zip, MAHOUT-941.patch, SGD.zip
>
>
> This patch does 2 things:
> # Add an feature to org.apache.mahout.text.SequenceFilesFromMailArchives that
> removes quoted text from email bodies. This is important because it avoid
> spamming the term dictionary with repeated text, especially in long email
> threads.
> ** The feature defaults to true. Add "--quoted" to the command line to keep
> the quoted lines.
> # Adds some dubious overall measurements to the ConfusionMatrix.
> ** Kappa - a standard measurement.
> *** How different is this confidence matrix from random numbers? 0.0 is the
> same, 1.0 is completely different.
> *** I think this is an "unweighted" kappa.
> ** "Success" - a homegrown formula attempting to represent the correctness of
> each box. Probably bogus.
> *** The standard deviation shows the distance between the success of each
> producer->consumer box.
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