SA Score -> Confidence Percentage

[John Rudd]

Does anyone have a scale that compares the SA score to a "percent 
likelihood that the message is spam"?


Something like "a score of 5 is a 75% chance than the message is spam". 
 But I don't want it just for a score of 5.  What I'd like is for 
scores of 1-10.  And I'd also like to see it for percentage likelihoods 
of 10, 20, 30, 40, 50, 60, 70, 75, 80, 85, 90, 95, 96, 97, 98, and 99 
(and maybe 100, but I expect that wont be meaningful) (so, I can say 
"an 80% likelihood happens at a score of 6" or something).

It seems as though something like this must be done to keep the right 
amount of the base spam/ham corpus used with the GA within expected 
values.  But I haven't ever seen an actual rating along these lines.  
Hopefully it's not in a completely obvious place that I've 
overlooked...