Stack ATT results into one comparison table

Row-binds several ATT results — trop() fits, panel_compare() results, synthdid estimates, existing cf_att_tbls, or anything as_att() understands — into a single cf_att_tbl ready for autoplot() or plot_counterfactual(). Each argument is passed through as_att() first, so multi-row inputs (e.g. a panel_compare() result) keep all their rows, and columns are aligned automatically. This replaces the manual rbind(as.data.frame(...), ...) + class(...) <- "cf_att_tbl" dance.

Usage

bind_att(...)

Arguments

...: Objects coercible by as_att(), optionally named to set the method label.

Value

A cf_att_tbl (a data.frame) with the inputs stacked row-wise.

Details

Names given to the arguments become method labels, overriding the label already on a single-row result; a name on a multi-row input is ignored with a warning (it cannot sensibly relabel several methods at once). For per-object control of other fields such as outcome, coerce that object with as_att() first and pass the result in unnamed.

Examples

df <- sim_panel(N = 14, T = 9, n_treated = 3, t0 = 6, att = 2, seed = 1)
lam <- list(time = 0.1, unit = 0.5, nn = 2)   # fixed penalties (fast example)
f_pooled   <- trop(df, "y", "w", "id", "t", anchor = "pooled",
                   lambda = lam, se = "none")
f_per_cell <- trop(df, "y", "w", "id", "t", anchor = "per_cell",
                   lambda = lam, se = "none")
bind_att(pooled = f_pooled, per_cell = f_per_cell)
#>    method estimate std.error conf.low conf.high n_treated_cells n_treated_units
#>    pooled   1.6018        NA       NA        NA              12               3
#>  per_cell   1.5904        NA       NA        NA              12               3
#>  outcome    engine rank note
#>        y cfcompare    3 <NA>
#>        y cfcompare    2 <NA>