Reversal-design piecewise terms

Returns the first-run time terms followed by the per-transition step and trend terms created by the reversal coder (e.g. level_A1B1, level_B1A2, level_A2B2), in column order. Only first-run times enter the model; the continuing trend_* terms carry every later slope. A combined design whose tiers start in different phases carries one first-run time per starting phase (e.g. time_A1 and time_B1).

Usage

reversal_terms(nm)

Arguments

nm

Column names of processed data.

Value

Character vector of term names; empty when the data carry no reversal coding.

Examples

d <- data.frame(case = "P1", time = 1:12, outcome = rnorm(12),
                phase = rep(c("A", "B", "A", "B"), each = 3))
reversal_terms(names(process_scd_phases(d, list(), "reversal")))
#> [1] "time_A1"    "level_A1B1" "trend_A1B1" "level_B1A2" "trend_B1A2"
#> [6] "level_A2B2" "trend_A2B2"