Identify the treatment coefficient of a piecewise SCD model

Picks the first numeric treatment-onset column among level_AB, the reversal onset step, changing-criterion steps, alternating-treatment dummies, treatment, and phase_num. When formula_str is supplied, only columns that appear as formula terms qualify.

Usage

treatment_coef(data, formula_str = NULL)

Arguments

data

Processed data frame.

formula_str

Optional character formula string.

Value

Column name, or NULL when none qualifies.

Examples

treatment_coef(data.frame(level_AB = c(0, 1), outcome = c(1, 2)))
#> [1] "level_AB"