twang: plot.ps – R documentation

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twang

plot.ps

Plots for ps objects

Description

This function produces a collection of diagnostic plots for ps objects.

Usage

## S3 method for class 'ps'
plot(x, plots = "optimize", subset = NULL, color = TRUE, ...)

Arguments

`x`	A `ps` object.
`plots`	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.
`subset`	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.
`color`	If `color = FALSE`, figures will be gray scale. Default: `TRUE`.
`...`	Additional arguments.

Details

This function produces lattice-style graphics of diagnostic plots.

References

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.