Deprecated. Use ddid instead.
ddid2 is a legacy two-period wrapper for the Distributional
Difference-in-Differences estimator. The modern replacement
ddid uses a yname/gname/tname
interface and supports staggered treatment adoption natively.
Usage
ddid2(
formla,
xformla = NULL,
t,
tmin1,
tname,
data,
panel = TRUE,
dropalwaystreated = TRUE,
idname = NULL,
probs = seq(0.05, 0.95, 0.05),
iters = 100,
alp = 0.05,
method = "logit",
se = TRUE,
retEachIter = FALSE,
seedvec = NULL,
pl = FALSE,
cores = NULL,
biters = NULL,
cl = NULL
)Arguments
- formla
formula of the form
y ~ treat.- xformla
optional one-sided covariate formula.
- t
post-treatment period.
- tmin1
pre-treatment period.
- tname
name of the time column.
- data
data.frame.
- panel
logical; whether data are panel (must be
TRUE).- dropalwaystreated
logical; whether to drop always-treated units.
- idname
name of the unit id column.
- probs
quantile grid.
- iters
bootstrap iterations.
- alp
significance level.
- method
propensity score estimation method (
"logit").- se
logical; whether to compute bootstrap SEs.
- retEachIter
logical; return per-iteration results.
- seedvec
optional vector of seeds for reproducible bootstrap.
- pl
logical; parallel bootstrap.
- cores
number of cores.
- biters
alias for
iters; takes precedence if supplied.- cl
alias for
cores; takes precedence if supplied.