## Not run:
# fit <- brm(count ~ log_Age_c + log_Base4_c * Trt_c + (1+Trt_c|visit),
# data = epilepsy, family = "poisson", chains = 1)
# ## group-level means with corresponding covariances
# rf <- ranef(fit, var = TRUE)
# attr(rf, "var")
# ## group-level medians
# ranef(fit, estimate = "median")
# ## End(Not run)
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