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Posted to users@spamassassin.apache.org by Niamh Holding <ni...@fullbore.co.uk> on 2013/05/08 09:07:05 UTC
Bayes scores
Hello
Same score for BAYES_20 and BAYES_40 seems a bit strange
50_scores.cf:score BAYES_20 0 0 -0.001 -0.001
50_scores.cf:score BAYES_40 0 0 -0.001 -0.001
--
Best regards,
Niamh mailto:niamh@fullbore.co.uk
Re: Bayes scores
Posted by Bowie Bailey <Bo...@BUC.com>.
On 5/8/2013 12:06 PM, Niamh Holding wrote:
> Hello Bowie,
>
> Wednesday, May 8, 2013, 4:35:35 PM, you wrote:
>
> BB> makes a bit more sense.
>
> Not a lot, though to have BAYES_20 and BAYES_$) scoring the same.
A 20-40% confidence level is not high enough to have a significant
positive score nor is it low enough to have a significant negative
score, so they are both given a neutral score of -0.001. The score
can't actually be 0, or the rule hit would not show in the reports.
--
Bowie
Re: Bayes scores
Posted by Niamh Holding <ni...@fullbore.co.uk>.
Hello Bowie,
Wednesday, May 8, 2013, 4:35:35 PM, you wrote:
BB> makes a bit more sense.
Not a lot, though to have BAYES_20 and BAYES_$) scoring the same.
--
Best regards,
Niamh mailto:niamh@fullbore.co.uk
Re: Bayes scores
Posted by Bowie Bailey <Bo...@BUC.com>.
On 5/8/2013 3:07 AM, Niamh Holding wrote:
> Hello
>
> Same score for BAYES_20 and BAYES_40 seems a bit strange
>
> 50_scores.cf:score BAYES_20 0 0 -0.001 -0.001
> 50_scores.cf:score BAYES_40 0 0 -0.001 -0.001
A score of -0.001 basically means that the rule is active, but has no
real effect on the final score. In this case, Bayes thinks the message
is ham, but is not confident enough to merit a negative score. Take a
look at the full list of Bayes scores and it makes a bit more sense.
score BAYES_00 0 0 -1.5 -1.9
score BAYES_05 0 0 -0.3 -0.5
score BAYES_20 0 0 -0.001 -0.001
score BAYES_40 0 0 -0.001 -0.001
score BAYES_50 0 0 2.0 0.8
score BAYES_60 0 0 2.5 1.5
score BAYES_80 0 0 2.7 2.0
score BAYES_95 0 0 3.2 3.0
score BAYES_99 0 0 3.8 3.5
--
Bowie