[Spambayes] Graph results

[Justin Mason]

Alexander -- nice work!  Thanks for investigating this...

> 2. Spambayes continues to improve for a couple months,
>    but I'm starting to see an increase in errors after
>    about 4-5 months.  I don't know why this is; it might
>    be because spam is mutating, or it might be because
>    my definition of spam has been mutating.

Spam has definitely been mutating heavily in the last 4 months.

> Anyway, the next thing for me to really look at is the effect
> of aging...

As in expiration of tokens?  I thought SB didn't use that?
Or do you mean validity of trained results from >3 months ago...

--j.