Correlated errors in multivariate brms

Would it be possible to implement correlated errors in a multivariate model like in this example (see contents 2.4)?

Have you taken a look at There you will find details on how to specify residual correlations in brms.

Yes, I did. But residual correlations are modeled for all the response variables (y1, y2, y3 using the example above). I am wondering if it would it be possible to model it only for y1 and y2 (like in the example). Many thanks!

I see. Right now, brms either estimates all or no residual correlations between response variables mostly because everything in between comes with a lot of technicalities when specifying the Stan code.


OK, thank you for the prompt reply.