I am working with a multilevel multivariate mixed mode with 4 outcomes. I am having difficulties extracting the variances, coefficients of variations. Could anyone advise? I am new to bayesian statistics so it has been pretty rough.

Thank you

My example:

bform_1 <- bf(sur_dat ~ age+ (1|countrycode) + (1|regionid), family =lognormal()) + bf(number_child ~ parents + (1|countrycode) + (1|regionid), family = negbinomial()) + bf(v ~ country + (1|countrycode) + (1|regionid), family = negbinomial())

fit_2 <- brm(bform_1, data = train, chains = 2, cores = 2)


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