twang: plot.iptw – R documentation

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twang

plot.iptw

Plots for iptw objects

Description

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

Usage

## S3 method for class 'iptw'
plot(
  x,
  plots = "optimize",
  subset = NULL,
  color = TRUE,
  timePeriods = NULL,
  multiPage = FALSE,
  figureRows = NULL,
  hline = c(0.1, 0.5, 0.8),
  ...
)

Arguments

`x`	An `iptw` 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`	Used to restrict which of the `stop.method`s will be used in the figure. For example `subset = c(1,3)` would indicate that the first and third `stop.method`s (in alphabetical order of those specified in the original call to `iptw`) should be included in the figure.
`color`	If `color = FALSE`, figures will be gray scale. Default: `TRUE`.
`timePeriods`	The number of distinct time points. If `NULL`, this is assumed to be the number of `ps` objects (i.e., the number of distinct time points).
`multiPage`	When multiple frames of a figure are produced, `multiPage = TRUE` will print each frame on a different page. This is intended for situations where the graphical output is being saved to a file. Default: `FALSE`.
`figureRows`	The figure rows, passed to displayPlots. Default: `NULL`.
`hline`	Arguments passed to `panel.abline`.
`...`	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.