On Sat, 21 Mar 2015 20:51:49 +0000
RW <rwmailli...@googlemail.com> wrote:
The two calculations produce the same result when
Ns2/Nh2 = (Ns2-Ns1)/(Nh2-Nh1)
i.e. if spam and ham is being added in the same ratio that it occurs
in the database.
On 21.03.15 22:54, David F. Skoll wrote:
Yup, that's correct; I got it wrong by extrapolating from a numerical
example I picked.
Still, odds are your spam / ham ratio is likely to stay roughly the same
over the medium term.
hmmm why do you think that?
I think that the ratio can change if things get worse, e.g. if there are
many false-positives, people will start train them, so the ratio changes
towards negatives, and vice versa.
I feel ratios being moved according to a curve...
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