You can either estimate the prior as part of a hierarchical model, or use empirical Bayesian estimation. I spoke last year about an example of EBE applied to mu

You can either estimate the prior as part of a hierarchical model, or use empirical Bayesian estimation. I spoke last year about an example of EBE applied to music trends: https://mobile.twitter.com/achompas/status/887326993821388800 https://mobile.twitter.com/achompas/status/88732699382138880...