Asked about Is the difference real? Statistics for evals
Why is a paired comparison better than comparing two pass rates?
An answer that works
Most cases pass or fail for both versions, and those add noise without information. Looking only at disagreements removes that shared noise, so a real difference shows up with far fewer cases.
Reading an answer is not being able to give one. The section that teaches this is Is the difference real? Statistics for evals, 4 hours of Evaluation.
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