Adds a random effect column (prefixed with ".") to the design data frame, with optional grouping for nested random effects.
Usage
add_random_effect(design_df, ..., .nesting = NULL)
Arguments
- design_df
A data frame containing the rollout design and any parameters.
- ...
A single named expression specifying the random effect to add (e.g., u = rnorm(1, 0, 1)).
- .nesting
Optional character vector specifying grouping columns for nested random effects (default NULL).
Value
A tibble with the added random effect column.
Examples
df <- tibble::tibble(site = rep(1:2, each = 3))
add_random_effect(df, u = rnorm(1, 0, 1), .nesting = "site")
#> # A tibble: 6 × 2
#> site .u
#> <int> <dbl>
#> 1 1 2.76
#> 2 1 2.76
#> 3 1 2.76
#> 4 2 0.0465
#> 5 2 0.0465
#> 6 2 0.0465