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A probability provides a quantitative description of the likely occurrence of a particular event.

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What does Posterior tail-area probability mean in Causal Impact?

Your understanding is correct: if the tail-area probability is small, the effect of the intervention can be considered significant. … The tail-area probability is the probability under the calculated posterior that the response is at least as extreme (away from the expected value) as the observed one. …
Alain Hauser's user avatar