I was wondering how to interpret the estimate for categorical variables that I get with `brms`

- there is only one of my two factor levels attached to a response. How can I get estimates for the other level?

Sorry for being uninformed, I’m probably missing something really obvious here (linear combination of the other variables?). Is this what is meant by "reference category! as described here?

This is my model, a reduced version of a path analysis. `Food`

has two levels and I am trying to figure which one does what to survival, taking other metrics into account.

Model specs:

```
brm(bf(Survival ~ Food + Length + Pigmentation) +
bf(Length ~ Food),
family=gaussian,
data = f,
chains=4, cores=8,seed=17, iter=1000, warmup = 500, thin = 10, inits=0, silent=F,
prior=prior(normal(0, 1), b),
save_all_pars=T,control = list(adapt_delta = 0.99,max_treedepth=20)
```

Model output:

```
Family: MV(gaussian, gaussian)
Links: mu = identity; sigma = identity
mu = identity; sigma = identity
Formula: Survival ~ Food + Length + Pigmentation
Length ~ Food
Data: f (Number of observations: 58)
Samples: 4 chains, each with iter = 1000; warmup = 500; thin = 10;
total post-warmup samples = 200
Population-Level Effects:
Estimate Est.Error l-95% CI u-95% CI Eff.Sample Rhat
Survival_Intercept -0.01 0.10 -0.23 0.18 184 1.00
Length_Intercept -0.01 0.10 -0.21 0.17 196 1.01
Survival_FoodLowprotein 0.01 0.14 -0.25 0.30 227 0.99
Survival_Length 0.24 0.69 -1.10 1.62 236 0.99
Survival_Pigmentation 0.14 0.14 -0.16 0.42 262 0.99
Length_FoodLowprotein 0.01 0.14 -0.28 0.29 205 1.01
Family Specific Parameters:
Estimate Est.Error l-95% CI u-95% CI Eff.Sample Rhat
sigma_Survival 0.56 0.16 0.38 0.90 156 1.00
sigma_Length 0.52 0.05 0.43 0.63 189 1.01
Residual Correlations:
Estimate Est.Error l-95% CI u-95% CI Eff.Sample Rhat
rescor(Survival,Length) 0.14 0.52 -0.82 0.88 245 0.99
Samples were drawn using sampling(NUTS). For each parameter, Eff.Sample
is a crude measure of effective sample size, and Rhat is the potential
scale reduction factor on split chains (at convergence, Rhat = 1).
```

- Operating System: Ubuntu 18.04
- brms Version: 2.6.0