bal.table {twang}R Documentation

Compute balance table

Description

Extract the balance table from ps and dx.wts objects

Usage

bal.table(x)

Arguments

x a ps or dx.wts object

Details

bal.table is a generic function for extracting balance tables from ps and dx.wts objects. These objects usually have several sets of candidate weights, one for an unweighted analysis and perhaps several stop.methods. bal.table will return a table for each set of weights combined into a list. Each list component will be named as given in the x, usually the name of the stop.method. The balance table labeled “unw” indicates the unweighted analysis.

Value

Returns a data frame containing the balance information.

tx.mn The mean of the treatment group
tx.sd The standard deviation of the treatment group
ct.mn The mean of the control group
ct.sd The standard deviation of the control group
std.eff.sz The standardized effect size, (tx.mn-ct.mn)/tx.sd. If tx.sd is small or 0, the standardized effect size can be large or INF. Therefore standardized effect sizes greater than 500 are set to NA
stat the t-statistic for numeric variables and the chi-square statistic for continuous variables
p the p-value for the test associated with stat
ks the KS statistic
ks.pval the KS p-value computed using the analytic approximation, which does not necessarily work well with a lot of ties

See Also

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


[Package twang version 1.0-1 Index]