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From: Ted Dunning <ted.dunning@gmail.com>
Date: Tue, 31 May 2011 08:54:53 -0700
Message-ID: <BANLkTi=rWvLcY0LZxq9s_GcuA6+w2NXVBQ@mail.gmail.com>
Subject: Re: What does percentCorrect of CrossFloderLearner mean?
To: user@mahout.apache.org
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Argh....

log-likelihood should approach the percentage of INcorrect answers
(negated).

On Tue, May 31, 2011 at 7:49 AM, Xiaobo Gu <guxiaobo1982@gmail.com> wrote:

> Page 228 of version 7 of Mahout in Action says :
>
> Log-likelihood has a maximum value of zero and no bound on how far
> negative it can go. For highly accurate classifiers, the value of
> average log-likelihood should be close to the average percent correct
> for the classifier times the number of target categories.
>
> Average percent correct times the number of target categories is more
> than 0, while Log-likelihood is always less than 0, then is the above
> statement correct ?
>
>
>
> On Tue, May 31, 2011 at 10:45 PM, Xiaobo Gu <guxiaobo1982@gmail.com>
> wrote:
> > Does it mean the percent of records that the model has correctlly
> > predicted the target on the validate protion of the data set, then it
> > should be between 0 and 1, and the bigger the better performance of
> > the model ?
> >
> > Regards,
> >
> > Xiaobo Gu
> >
>

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