Classes of correlation structures available in the brms package. cor_brms is not a correlation structure itself, but the class common to all correlation structures implemented in brms.

Available correlation structures

cor_arma

autoregressive-moving average (ARMA) structure, with arbitrary orders for the autoregressive and moving average components

cor_ar

autoregressive (AR) structure of arbitrary order

cor_ma

moving average (MA) structure of arbitrary order

cor_car

Spatial conditional autoregressive (CAR) structure

cor_sar

Spatial simultaneous autoregressive (SAR) structure

cor_fixed

fixed user-defined covariance structure