PopulationPrior
@Serializable
Empirical-Bayes prior fitted across a population of related regression posteriors. Hand mean and covariance straight to BayesianRegressionStat's priorMean / priorCovariance constructor parameters to seed a new instance.
PopulationPrior
covariance
Population covariance: within-instance posterior + between-instance mean spread.
instanceCount
Number of per-instance posteriors that contributed to this prior.
mean
Population mean of the per-instance posterior means.