Asmodia goes up to the board and writes the example:
Ordinary Conspiracy Time-Traveler
------------ ---------------- -------------------
Prior: .80 .10 .03
'Writes' (Y) .50 .20 .80
'Quantifies' (Y) .60 .70 .90
'Prediction' (N) 1 - .40 1 - .20 1 - .90
"And then - Keltham didn't actually say this part, because it was obvious given what we already learned - he multiplied his starting probabilities by all the likelihoods for each of the events, and ended up with... give me a second..."
Product: .14 .011 .002
"Not that it was actually that, because those weren't actually his probabilities, but that's the obvious way to combine multiple pieces of evidence. Uh, though I'm leaving out the part where what really changes, is the ratio between the chances, not really the chances themselves. At the end it's like... 13 times as much Ordinary as Conspiracy, and 5 times as much Conspiracy as Time-Traveler, where previously it was 8 times as much Ordinary as Conspiracy and 3 times as much Conspiracy as Time-Traveler."