[Spambayes] how spambayes handles image-only spams

[Bill Yerazunis]

   From: "Meyer, Tony" <T.A.Meyer at massey.ac.nz>

   > I'm not aware that anyone's run against it - perhaps someone's got
   some CPU 
   > cycles burning a hole in their pocket and would like to try?

   I occasionally run against this.  An example (with 'fresh from cvs'
   spambayes):

   filename:  no_sean_sas
   ham:spam:  7580:7580
   fp total:       44
   fp %:         0.58
   fn total:       16
   fn %:         0.21
   unsure t:      356
   unsure %:     2.35
   real cost: $527.20
   best cost: $592.40
   h mean:       3.40
   h sdev:      14.19
   s mean:      97.94
   s sdev:       9.43
   mean diff:   94.54
   k:            4.00

What's your test protocol?  I did "shuffle messages randomly, but
preserve knowledge of which class they were in, then train with the
first 90% and then test with the last 10%".  Repeat as needed...

      -Bill Yerazunis