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