MatchIt (version 1.0-1)

summary.matchit: 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.

See Also

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