Balance statistics for CBPS Objects
Generates balance statistics for CBPS
and CBMSM
objects from the CBPS package.
## S3 method for class 'CBPS' bal.tab(x, stats, int = FALSE, poly = 1, distance = NULL, addl = NULL, data = NULL, continuous, binary, s.d.denom, thresholds = NULL, weights = NULL, cluster = NULL, imp = NULL, pairwise = TRUE, s.weights = NULL, abs = FALSE, subset = NULL, quick = TRUE, ...) ## S3 method for class 'CBMSM' bal.tab(x, stats, int = FALSE, poly = 1, distance.list = NULL, addl.list = NULL, data = NULL, continuous, binary, s.d.denom, thresholds = NULL, weights = NULL, cluster = NULL, imp = NULL, s.weights = NULL, abs = FALSE, subset = NULL, quick = TRUE, ...)
x |
a |
stats |
|
int |
|
poly |
|
distance, distance.list |
an optional formula or data frame containing distance values (e.g., propensity scores) or a character vector containing their names. If a formula or variable names are specified, |
addl, addl.list |
an optional formula or data frame containing additional covariates for which to present balance or a character vector containing their names. If a formula or variable names are specified, |
data |
an optional data frame containing variables that might be named in arguments to |
continuous |
whether mean differences for continuous variables should be standardized ( |
binary |
whether mean differences for binary variables (i.e., difference in proportion) should be standardized ( |
s.d.denom |
|
thresholds |
a named vector of balance thresholds, where the name corresponds to the statistic (i.e., in |
weights |
a named list containing additional weights on which to assess balance. Each entry can be a vector of weights, the name of a variable in |
cluster |
either a vector containing cluster membership for each unit or a string containing the name of the cluster membership variable in |
imp |
either a vector containing imputation indices for each unit or a string containing the name of the imputation index variable in |
pairwise |
whether balance should be computed for pairs of treatments or for each treatment against all groups combined. See |
s.weights |
Optional; either a vector containing sampling weights for each unit or a string containing the name of the sampling weight variable in |
abs |
|
subset |
A |
quick |
|
... |
Further arguments to control display of output. See display options for details. |
bal.tab.CBPS()
and bal.tab.CBMSM()
generate a list of balance summaries for the CBPS
or CBMSM
object given and functions similarly to CBPS::balance()
.
The thresholds
argument controls whether extra columns should be inserted into the Balance table describing whether the balance statistics in question exceeded or were within the threshold. Including these thresholds also creates summary tables tallying the number of variables that exceeded and were within the threshold and displaying the variables with the greatest imbalance on that balance measure.
The CBPS
object does not return sampling weights even if they are used; rather, the weights returned already have the sampling weights combined within them. Because some of the checks and defaults in bal.tab()
rely on patterns in these weights, using sampling weights in CBPS()
without specifying them in bal.tab()
can lead to incorrect results. If sampling weights are used in CBPS()
, it is important that they are specified in bal.tab()
as well.
For point treatments, if clusters are not specified, an object of class "bal.tab"
containing balance summaries for the CBPS
object. See bal.tab()
for details.
If clusters are specified, an object of class "bal.tab.cluster"
containing balance summaries within each cluster and a summary of balance across clusters. See bal.tab.cluster
for details.
If CBPS()
is used with multi-category treatments, an object of class "bal.tab.multi"
containing balance summaries for each pairwise treatment comparison and a summary of balance across pairwise comparisons. See bal.tab.multi
for details.
If CBMSM()
is used for longitudinal treatments, an object of class "bal.tab.msm"
containing balance summaries for each time period and a summary of balance across time periods. See bal.tab.msm
for details.
Noah Greifer
bal.tab()
for details of calculations.
bal.tab.cluster
for more information on clustered data.
bal.tab.multi
for more information on multi-category treatments.
bal.tab.msm
for more information on longitudinal treatments.
library(CBPS) data("lalonde", package = "cobalt") ## Using CBPS() for generating covariate balancing ## propensity score weights cbps.out <- CBPS(treat ~ age + educ + married + race + nodegree + re74 + re75, data = lalonde) bal.tab(cbps.out)
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