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Message: [QUOTE="javadoc, post: 1225409, member: 338"] I haven't followed the statistical models and calculations that underlie these systems, so how accurate and reliable are they? What are the margins of uncertainty? If the model tells you one choice gives you 15% and another gives you 19%, is that significant enough to act on? I'm more interested in cases where the system tells you that your gut choice is really 25% worse than alternatives, sort of an "aha!" moment. Have there been any such, or are we generally talking small differences? [/QUOTE]