Create a random effects covariance parameter object for use with other functions.
Arguments
- ...
A named vector (or vectors) whose names represent the name of each random effect and whose values represent the variance of each random effect. If unnamed,
nm
is used to set names.- nm
A character vector of names to assign to
...
.
Details
Names of the random effects should match eligible names given to
random
in modeling functions. While with the random
argument to these functions, an
intercept is implicitly assumed, with randcov_params
, an intercept must be
explicitly specified. That is, while with random
, x | group
is shorthand for (1 | group) + (x | group)
, with randcov_params
,
x | group
implies just x | group
, which means that if 1 | group
is also desired, it must be explicitly specified.
Examples
randcov_params(group = 1, subgroup = 2)
#> group subgroup
#> 1 2
randcov_params(1, 2, nm = c("group", "subgroup"))
#> group subgroup
#> 1 2
# same as
randcov_params("1 | group" = 1, "1 | subgroup" = 2)
#> 1 | group 1 | subgroup
#> 1 2