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List:       wekalist
Subject:    Re: [Wekalist] isn't a lower false positive rate preferable?
From:       Bill Claster <william108 () gmail ! com>
Date:       2010-03-30 2:55:58
Message-ID: 1c58f0471003291955n44d07866yd5a81d52c7c5b0d8 () mail ! gmail ! com
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Thanks!

On Tue, Mar 30, 2010 at 5:18 AM, Mark Hall <mhall@pentaho.com> wrote:
> On 29/03/10 9:39 PM, Bill Claster wrote:
>>
>> Hello All. I am using Experimenter. When evaluating the results
>> Experimenter uses the notation 'v' and '*' to indicate a comparison
>> with a baseline (the user sets the baseline model). As is said in
>> Witten's book,
>> "The symbol placed beside a result indicates that it is statistically
>> better (v) or worse (*) than the baseline scheme"
>>
>> However if you are testing for False Positive Rate it seems that a
>> lower rate is better right? However the Experimenter Test Output for
>> this seems to mark a higher number as 'v'. Is this right?
>> Here is the output I have.
>> Dataset                   (1) functions.Sim | (2) trees.J48  (3)
>> trees.Simp
>>
>> ---------------------------------------------------------------------------
>> CasaDonoso90Day-weka.filt(100)   0.12(0.01) |   0.07(0.02) *   0.08(0.01)
>> *
>> Kumeu90days-weka.filters.(100)   0.11(0.01) |   0.14(0.02) v   0.13(0.01)
>> v
>>
>> Thank you.
>
> Yes, this is correct. In this case, you just reverse the interpretation of
> the symbols - * is better.
>
> Cheers,
> Mark.
>
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