Generic in the style of nlme::ranef / lme4::ranef,
redefined here so cevcmm avoids a hard dependency on either.
If you also have nlme or lme4 loaded, call
cevcmm::ranef(fit) explicitly.
Value
The return value depends on the class of object; see
the appropriate method (e.g. ranef.vcmm_fit for
vcmm_fit objects, which returns a numeric vector, matrix,
or list reshaped to match the fitted re_cov structure).