AnswerPeak Experiments
What does evidence level A to E mean?
It says how robust a result is methodologically, not how confident you feel. The design sets the upper limit: randomized at most A, quasi-experimental B, before/after C, qualitative D. Every limitation lowers it by one level: sample too small, stopped early, data problems, confounders, accepted overlaps, or changes to the hypothesis, metric or threshold after the start. Under “Advanced”, every reason is listed.
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