How do I input my informed priors for regression?
Mostly new to Bayesian approach and totally new to JASP. Trying to leverage Bayes regression (or ANOVA) to tighten up the CI (from my in-market test) into a "credible interval" for parameter estimation. I don't conceptually have a null here, I just want an interval around my estimation of sales lift from a test treatment.
Frequentist regression/anova is:
sales = f((test vs control market (1 or 0), post vs pre time period (1 or 0), test/post interaction (1 or 0)).
The test/post interaction is my treatment and what I am interested in. I have a solid prior based on previous analysis.
What confuses me is that I would expect to somewhere input my prior distribution (presumably via a mean estimate and standard deviation), but I don't see anywhere to do that. JASP just seems to default to an uninformed prior.
Any help getting in the right direction greatly appreciated!