Expand rd_vcov using variable names in case "full" is used
expand_rd_vcov_full(rd_vcov, rd_outnam)
A named list per grouping level where each elements contains
information on how the random effects variance-covariance matrices on
that level are structured. Per level there is a list of grouping
structures containing the names of variables in each structure
(e.g. list(full = c("a", "b"), indep = "c")
)
the random effects variance covariance structure provided by
the user (check_rd_vcov_list()
is called internally)
list by grouping level of the names of the outcome variables that have random effects on this level