summary.matchit {MatchIt}R Documentation

Summarizing Quantities of Interest

Description

The matchit method for the generic summary command generates default output.

Usage

## S3 method for class 'matchit':
summary(object, verbose=F, sig=2, ...)

Arguments

object stored output from matchit.
sig Optionally specifies the size of the t-statistic for a covariate to be labeled "problematic" (default=2).
verbose Option to show summary statistics in sum.all and sum.matched for all covariates, their squares, and two-way interactions when verbose=TRUE and only the covariates themselves when verbose=FALSE (default).
... Additional parameters passed to summary.default.

Value

call The original assignment model call.
sum.all Data frame containing summary statistics on all observations in the treated and control groups (means, standard deviations, t-statistics and bias statistics for all covariates).
sum.matched Data frame containing summary statistics on the matched observations in the treated and control groups (means, standard deviations, t-statistics, bias statistics, and whether bias was reduced by the matching).
Problematic Problematic covariates that remain imbalanced in the matched samples. Variables listed when the absolute value of the t-statistic in the matched sample exceeds sig.
xn Sample sizes in the full and matched samples.
q.table Array that contains the same information as sum.all and sum.matched for each subclass.
qn Sample sizes in the full and matched samples, by subclass.
match.matrix From the matchit output.
psclass From the matchit output.
in.sample From the matchit output.

Author(s)

Daniel Ho <deho@fas.harvard.edu>; Kosuke Imai <kimai@princeton.edu>; Gary King <king@harvard.edu>; Elizabeth Stuart<stuart@stat.harvard.edu>

See Also

Please use help.matchit to access the matchit reference manual. The complete document is available online at http://gking.harvard.edu/matchit.


[Package MatchIt version 0.1-8 Index]