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From Xiaobo Gu <guxiaobo1...@gmail.com>
Subject Re: What does percentCorrect of CrossFloderLearner mean?
Date Wed, 01 Jun 2011 01:38:30 GMT
On Tue, May 31, 2011 at 11:54 PM, Ted Dunning <ted.dunning@gmail.com> wrote:
> Argh....
>
> log-likelihood should approach the percentage of INcorrect answers
> (negated).

Then we just only to see if the average log likeliyhood is closer to 0
to determine the perfmonce of the model, regardless the relationship
between it and percentage of INcorrect or correct answers?


> 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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