plot.mnps {twang}

Plots for mnps objects

Description

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

Usage

## S3 method for class 'mnps'
plot(
  x,
  plots = "optimize",
  pairwiseMax = TRUE,
  figureRows = NULL,
  color = TRUE,
  subset = NULL,
  treatments = NULL,
  singlePlot = NULL,
  multiPage = FALSE,
  time = NULL,
  print = TRUE,
  hline = c(0.1, 0.5, 0.8),
  ...
)

Arguments

x

An mnps 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.

pairwiseMax

If FALSE, the plots for the underlying ps fits will be returned. Otherwise, pairwise maxima will be returned.

figureRows

The number of rows of figures that should be used. If left as NULL, twang tries to find a reasonable value.

color

If color = FALSE, figures will be gray scale. Default: TRUE.

subset

Used to restrict which of the stop.methods will be used in the figure. For example subset = c(1,3) would indicate that the first and third stop.methods (in alphabetical order of those specified in the original call to mnps) should be included in the figure.

treatments

Only applicable when pairwiseMax is FALSE and plots 3, 4, and 5. If left at NULL, panels for all treatment pairs are created. If one level of the treatment variable is specified, plots comparing that treatment to all others are produced. If two levels are specified, a comparison for that single pair is produced.

singlePlot

For Plot calls that produce multiple plots, specifying an integer value of singlePlot will return only the corresponding plot. E.g., specifying singlePlot = 2 will return the second plot.

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.

time

For use with iptw.

print

If FALSE, the figure is returned but not printed. Default: TRUE.

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.

See Also

mnps