On 01/10/10 12:42, Julien Vehent wrote:
> Hi there,
>
> I was browsing the code to understand the value of X-DSPAM-CONFIDENCE and I'm
> not sure I understand its meaning completely.
>
> --- libdspam.c ---
> /* Calculate Confidence */
>
> if (CTX->algorithms & DSP_MARKOV) {
> if (CTX->result == DSR_ISSPAM)
> {
> CTX->confidence = CTX->probability;
> }
> else
> {
> CTX->confidence = 1.0 - CTX->probability;
> }
> } else {
> if (CTX->result == DSR_ISSPAM)
> {
> CTX->confidence = rob_result;
> }
> else
> {
> CTX->confidence = 1.0 - rob_result;
> }
> }
> ------------------
>
> As I understand the code, if a message is a spam, confidence = probability.
> If the message is a ham, confidence = (1 - probability).
> How does that gives an information on the level of maturity DSPAM has reached
> ?
>
> Thanks,
> Julien
>
Probability is the 'chance' that a message is spam. A very low
probability means that a message is innocent. The lower the probability
is, the more confident DSPAM is that the message is innocent.
For example:
- probability=0.99 means 99% confident that a message is spam.
- probability=0.01 means 1% confident that the message is spam, or 99%
confident that it is innocent.
The calculation is there to make the confidence number have the same
value for both ham and spam: DSPAM is equally confident, but on a
different decision.
Regards,
Tom
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