This function extracts metadata from a design matrix and returns a data.table with the following columns:
effects: the name of the effect
fixed: a logical indicating whether the effect is fixed (1) or random (0).
It automatically drops the intercept (defined as "(Intercept)").
This function is useful for constructing a model design object for random
effects when used in combination with ewn_add_pooling_effect.
Arguments
- design
A design matrix as returned by
stats::model.matrix().
Value
A data.table with the following columns:
effects: the name of the effect
fixed: a logical indicating whether the effect is fixed (1) or random (0)
See also
Functions used to formulate models
enw_add_cumulative_membership(),
enw_add_pooling_effect(),
enw_design(),
enw_one_hot_encode_feature()
Examples
data <- data.frame(a = 1:3, b = as.character(1:3), c = c(1,1,2))
design <- enw_design(a ~ b + c, data)$design
enw_effects_metadata(design)
#> effects fixed
#> <char> <num>
#> 1: b2 1
#> 2: b3 1
#> 3: c 1