MatchIt (version 1.0-1)

summary.neyman: Summarizing the estimated treatment effects

Description

Calculates basic estimate of treatment effect, using simple difference in means and Neyman's estimate of the variance. Also provides test of significance and subclass estimates if applicable.

Usage

## S3 method for class 'neyman':
summary(object, ...)

Arguments

object

(required). Stored output from neyman.

...

Further arguments passed to or from other methods.

Value

• Returns estimate of the effect of the treatment, as well as the standard deviation of that estimate, a test of significance of the estimate, and subclass estimates if applicable. Also shows the sample sizes of the matched treated and control groups used to estimate the treatment effect.

Details

Calculates overall treatment effect estimate using matched samples generated by matchit. Also gives test of significance of the estimated treatment effect, and subclass estimates, if applicable. If subclasses were generated in the matching procedure, an overall estimate is also provided, which is a weighted average over the subclasses, with subclass weights defined by the sub.by option in the matchit call. The standard deviation can also be estimated using the bootstrap procedure, which is often used when matching done with replacement. For more details on the calculations, see the complete documentation (link below).

See Also

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