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This is my first time using Bayesian statistics and the CausalImpact package in R. I'm a bit confused about whether this is using one-tail or two-tailed probability testing and was wondering if anyone knows the answer? The verbose option of the summary output suggests that it is one-tailed. I am trying to test whether there has been a change in any direction (positive or negative) following an intervention rather than having a specific direction in mind. Is this still a suitable method to be using? Thanks in advance.

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  • $\begingroup$ Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. $\endgroup$
    – Community Bot
    Commented Aug 14 at 15:49
  • $\begingroup$ See stats.stackexchange.com/q/415087/7071 $\endgroup$
    – dimitriy
    Commented Aug 14 at 15:57

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