Default priors for logistic regression coefficients in brms

I think the McElreath advice is the best. That priors page needs updated, really.

I think the state of our priors recommendations are just thinking about them in terms of the predictions you’re making (so like in logistic regression putting prior mass exclusively at 0 and 1 seems weird).

Here’s a video on it: https://www.youtube.com/watch?v=ZRpo41l02KQ&t=2694

So normal(0, 1.5) seems like a good starting point, but maybe that needs to change for your problem too.

4 Likes