[Spambayes] aging information

[D. R. Evans]

Does spambayes have any concept that "the older information is, the 
less value it has"?

I ask because one's notion of what constitutes spam could change over 
time, so it would seem reasonable to gradually (over a period of 
weeks/months) decrease the effect of old training. (Probably by some 
sort of exponential decay, so that, for example, every day the value of 
old material is shifted slightly toward 0.5 by multiplying the 
difference from 0.5 by a factor of 0.99, or some such algorithm.)

  Doc Evans

PS I am a new user (following the "Linux Journal" article. So far, I am 
impressed at how well spambayes works. So far (after a few days) it has 
not classified any ham as spam, and it is now catching about three 
quarters of the spam.

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