twang (version 0.6-1)

bal.stat: Calculate weighted balance statistics

Description

bal.stat compares the treatment and control subjects by means, standard deviations, effect size, and KS statistics

Usage

bal.stat(data, 
         vars = NULL, 
         treat.var, 
         w.all, 
         get.means = TRUE,
         get.ks = TRUE, 
         na.action = "level")

Arguments

data

a data frame containing the data

vars

a vector of character strings with the names of the variables on which the function will assess the balance

treat.var

the name of the treatment variable

w.all

observation weights (e.g. propensity score weights, sampling weights, or both)

get.means

logical. If TRUE then bal.stat will compute means and variances

get.ks

logical. If TRUE then bal.stat will compute KS statistics

na.action

a character string indicating how bal.stat should handle missing values. Current options are "level", "exclude", or "lowest"

Value

• See ps.summary for details on the returned object. get.means and get.ks manipulate the inclusion of certain columns in the returned result.

Details

bal.stat calls ps.summary.f and ps.summary.n for each variable and assembles the results in a table

See Also

The example for ps contains an example of the use of bal.table