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get_ipws_for_study() and the
weight_type / ipw_use_glm arguments of
boot_km_ratio(), which now always uses SBW weights. The
package is scoped to SBW; inverse-probability weighting was only a
comparison method for the paper’s simulations. Code that needs it can
install v0.2.0
(remotes::install_github("kaylairish/sbwadjust@v0.2.0")).km_ratio_loglog_greenwood() to
km_ratio_greenwood(). Its CI was always a Wald CI on the
log scale; the old name described an intermediate log-log step that
cancels out. That step is gone: se(log S) is now computed
directly as se(S) / S, which gives identical results except
that an arm with no events by t0 (S = 1) now contributes
zero to se_log instead of making it NaN.boot_km_ratio(): dropped the unused
verbose argument; the SBW clipping summaries are now
NA (not -Inf/NaN with a warning)
when no bootstrap resample’s SBW fit succeeds; the help page now
documents that a failed resample uses the unadjusted KM ratio.km_ratio_greenwood() now accepts a factor treatment
indicator, and its help page notes that the SE treats the weights as
fixed.sbw_estimate() now stops with a clear message when the
outcome has a different length from the data the weights were fit on
(e.g. an outcome variable missing from data that R found
elsewhere), instead of failing later with an unrelated bootstrap
error.sbw_estimate() returned an NaN
standard error and CI when some bootstrap resamples gave an infinite
estimate (e.g. "RR" with a rare outcome, where a resample
can draw no control events). Those resamples now count as failed and are
reported in boot_fail_rate.sbw_estimate() now gives a clear error when a
Surv() outcome is used with an estimand other than
"survival_ratio".sbw_weights() now accepts the treatment column name as
a string (treatment = "arm", or a variable holding it), not
only unquoted. Previously a quoted name failed with a misleading
“exactly two levels” error.sbw_weights() now gives clear errors for a treatment
with missing values or with only one arm, which previously failed inside
the solver with unrelated messages (e.g. “system is exactly
singular”).?sbw_weights now states which level of a factor or
character treatment is treated (the second level; alphabetical for
character), and print.sbw_fit() names the treated and
control levels in that case.sbw_weights() now gives clear errors when the balance
covariates are collinear within an arm (including a factor level that
never occurs in one arm) or when exact balance with nonnegative weights
is infeasible, instead of the solver’s “system is exactly singular” or
quadprog’s “constraints are inconsistent, no solution!”.print.sbw_fit() now reports how many units in each arm
got weight 0, replacing the “weight(s) clipped at 0” note, which counted
rounding noise in the solver rather than dropped units.
summary() does the same: its n_clipped /
max_abs_clipped elements are replaced by
n_zero (by arm), and its balance table prints to 4
significant digits.summary() no longer reports an effective sample size.
The Kish ESS measures how concentrated the weights are, not the
precision of the treatment-effect estimate, and was easy to misread as
the latter.plot.sbw_fit() failed when given
main, xlim, xlab or
ylab (documented as passed on to plot());
these now override the defaults. The plot also lists covariates top-down
in formula order and widens the left margin so long covariate names are
not cut off.“Usable by a stranger” release: a user-facing formula API on top of the v0.1 core.
sbw_weights(): formula/data/treatment front end to
the core SBW solver, returning an sbw_fit object with
print(), summary(), plot(), and
weights() methods.sbw_estimate(): treatment-effect estimation from an
sbw_fit, with a bootstrap confidence interval, for a closed
menu of estimands: average treatment effect ("ATE"),
relative risk ("RR"), survival ratio
("survival_ratio"), Mann-Whitney win probability
("mann_whitney", uncensored outcomes only), and quantile
contrasts ("quantile_diff" /
"quantile_ratio")..weighted_quantile()
internal helper: the generalized-inverse (step-function / type 1)
SBW-weighted empirical quantile, matching the empirical-process
framework the paper’s differentiability results use.sbw_estimate(estimand = "survival_ratio") now warns
when the SBW point estimate or bootstrap SE is non-finite and the
unadjusted Kaplan-Meier ratio is returned in its place (previously
flagged only by mc_fail).sbw_estimate() gains a data argument, so
weights can be fit on baseline data before outcomes exist and outcomes
supplied at analysis time. Rows must line up one-to-one with the fitted
data; row count and any shared columns are checked.sbw_estimate()’s bootstrap failed on every
resample when sbw_weights() was given
treatment as a vector rather than a column name. The
bootstrap now resamples the stored 0/1 treatment directly.Surv() in a survival_ratio outcome formula
now resolves without attaching the survival package, and missing
survival times are rejected instead of silently dropped.?sbw_estimate now notes that the row bootstrap assumes
simple randomization and does not account for stratified or
covariate-adaptive designs.\%in\% rendering with stray backslashes in
?sbw_estimate), added a runnable @examples
block to sbw_estimate(), fixed the DESCRIPTION
citation style, added URL/BugReports fields,
and added inst/WORDLIST for
spelling::spell_check().Initial public release. Core stable-balancing-weight machinery, consolidated from the four near-duplicate copies used across the paper’s simulations:
get_weights_for_group_neg(),
get_weights_for_group_nonneg(),
get_sbws_for_study() — closed-form SBW solve with a
nonnegative quadratic-programming fallback.km_ratio_loglog_greenwood(),
boot_km_ratio() — weighted Kaplan-Meier survival-ratio
point estimates and bootstrap confidence intervals.get_ipws_for_study() — inverse-probability weights,
used as a comparison method.These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.