| bal.table {twang} | R Documentation |
Extract the balance table from ps and
dx.wts objects
bal.table(x)
x |
a ps or dx.wts object |
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.
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 |
The example for ps contains an example of the
use of bal.table