ps
objectsThis function produces a collection of diagnostic plots for ps
objects.
# S3 method for ps
plot(x, plots = "optimize", subset = NULL, color = TRUE, ...)
A ps
object.
An indicator of which type of plot is desired. The options are
"optimize" or 1
A plot of the balance criteria as a function of the GBM
iteration.
"boxplot" or 2
Boxplots of the propensity scores for the treatment and
control cases
"es" or 3
Plots of the standardized effect size of the pre-treatment
variables before and after reweighing
"t" or 4
Plots of the p-values from t-statistics comparing means of
treated and control subjects for pretreatment variables, before and after
weighting.
"ks" or 5
Plots of the p-values from Kolmogorov-Smirnov statistics
comparing distributions of pretreatment variables of treated and control
subjects, before and after weighting.
If multiple stop.method
rules were used in the ps()
call,
subset
restricts the plots of a subset of the stopping rules that were
employed. This argument expects a subset of the integers from 1 to k,
if k stop.method
s were used.
If color = FALSE
, figures will be gray scale. Default: TRUE
.
Additional arguments.
This function produces lattice-style graphics of diagnostic plots.
Dan McCaffrey, G. Ridgeway, Andrew Morral (2004). "Propensity Score Estimation with Boosted Regression for Evaluating Adolescent Substance Abuse Treatment", Psychological Methods 9(4):403-425.
ps