[Spambayes] New option: summarize_email_prefixes

Neale Pickett neale at watchguard.com
Wed Dec 11 22:02:16 EST 2002


Skip Montanaro <skip@pobox.com> writes:

> It's not a big win, but "pfxlen:big" is a very strong spam indicator.
> It might help on small messages without many other clues.  I'd like
> others to give it a try and post their results.

It didn't make one bit of difference for me.  So if's helpful to you,
I'm okay with it :)

"""
cv1s -> cv2s
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams
-> <stat> tested 200 hams & 200 spams against 800 hams & 800 spams

false positive percentages
    1.000  1.000  tied          
    1.000  1.000  tied          
    2.000  2.000  tied          
    3.000  3.000  tied          
    0.000  0.000  tied          

won   0 times
tied  5 times
lost  0 times

total unique fp went from 14 to 14 tied          
mean fp % went from 1.4 to 1.4 tied          

false negative percentages
    0.500  0.500  tied          
    0.500  0.500  tied          
    0.000  0.000  tied          
    0.500  0.500  tied          
    0.000  0.000  tied          

won   0 times
tied  5 times
lost  0 times

total unique fn went from 3 to 3 tied          
mean fn % went from 0.3 to 0.3 tied          

ham mean                     ham sdev
   4.39    4.39   +0.00%       16.31   16.31   +0.00%
   3.62    3.62   +0.00%       14.22   14.22   +0.00%
   5.01    5.01   +0.00%       18.67   18.67   +0.00%
   4.94    4.94   +0.00%       19.29   19.29   +0.00%
   4.20    4.21   +0.24%       14.37   14.38   +0.07%

ham mean and sdev for all runs
   4.43    4.43   +0.00%       16.71   16.71   +0.00%

spam mean                    spam sdev
  99.23   99.23   +0.00%        6.99    6.99   +0.00%
  99.26   99.26   +0.00%        7.41    7.41   +0.00%
  99.96   99.96   +0.00%        0.31    0.25  -19.35%
  98.96   98.96   +0.00%        8.51    8.51   +0.00%
  99.63   99.63   +0.00%        2.71    2.71   +0.00%

spam mean and sdev for all runs
  99.41   99.41   +0.00%        6.07    6.07   +0.00%

ham/spam mean difference: 94.98 94.98 +0.00
"""



More information about the Spambayes mailing list